Tactical Power Generation Specialist MOS 91D

Tactical Power Generation Specialist MOS 91D

The MOS 91D is a job in the Electrical and Information Systems unit for the United States Army. This position involves working with electricity to create power for military purposes. In addition to having experience with personal protection equipment, hand tools, and other skills needed in this position, candidates also must have an interest in a job involving electricity and large machinery. Often working in remote or isolated environments, you may need to make temporary repairs using limited tools until a generator can be returned to an installation site for maintenance by personnel with the proper equipment and experience.

MOS 91D is a part of Us Army Mos List 2021.

Specialist MOS 91D

Requirements: Qualifications and Skills

There are qualifications and skills related to MOS 91D:


ASVAB scores must be valid at the time of application to qualify for consideration. A minimum score of 88 on the General Maintenance (GM) plus 88 on the General Technical (GT) or solely 98 on the GM segment is required.

They are also required to participate in Basic Combat Training for ten weeks and ten weeks of Advanced Individual Training.

Besides, there are also some preferred skilled:

Hand equipment experience

To be a Tactical Power Generation Specialist, you should have basic hand and power-tool skills. You should be familiar with power tools, including drills, ratchet sets, impact wrenches, screwdrivers, hacksaws, and levels. Hand-specific equipment such as electric drills, clamps, saws, circuit breakers will be used while maintaining proper safety procedures at all times. Understanding how to use hand tools will help you perform quick fixes when necessary.

Interest in large machinery

As a Tactical Power Generation Specialist (MOS 91D), you will work with large electric generators that are capable of powering an entire camp. However, the vast majority of people who go into Military occupational specialties, such as electronics or information technology, have had some experience with power tools and/or other heavy machinery. You may also need to transport generators by helicopter or load them onto trucks for transport to forward areas or installation sites. 

Think critically 

Tactical Power Generation Specialists must think critically. After all, your work requires quick decision-making and the ability to solve problems with limited tools and equipment. Facing with a variety of situations in which you must make life-or-death decisions. You should be able to think critically about these situations and evaluate your options in order to pick the best course of action. If a decision seems in conflict with what you have been taught in school concerning right and wrong, think critically about it and ask yourself whether there really is a conflict. If not, then there is no reason for you or anyone else to feel that your actions or inactions would be immoral or unethical.

You may need to improvise when repairing generators, building emergency shelters, or performing minor outdoor repairs. Factors such as light, heat, sound, time of day, and weather can also affect your job performance.

Work under pressure

Work under pressure

You will be expected to work under considerable stress on a regular basis, carrying out highly specialized tasks with limited supplies. You are required to be able to work under pressure and complete tasks with a minimal amount of supervision. You may also need to make emergency repairs to generators in the field. These situations, along with others involving life and death choices, can cause you to feel overwhelmed and stressed. If this happens, take time outside of your job to clear your mind and relax. You should also try not to let your work environment affect you or your personal life.

Job Responsibilities

A few main responsibilities of MOS 91D are:

Maintain and provide generator operation

Maintain and provide generator operation

The technician must have knowledge of generator setup procedures under the supervisor’s guidance. This job is about maintenance of the generators and understanding how to operate/maintain power grid under the supervision of two or more staff sergeants or above. They are assigned to maintain the generator set up for different requirements from time to time, like Medivac (helicopters), command post (CP), and search and rescue (SAR) missions. 

They are also assigned to provide generator operation. The generator technician must report to the aircraft maintenance shop (AMX) team chief to receive the mission. They are responsible for operating and maintaining generators at fixed locations, forward operating bases, or forward area refueling stations. 

Tactical Power Generation Specialists are responsible for ensuring that the electrical needs are met in order to operate sensitive equipment. They also assist in obtaining lighting during blackout conditions. Tactical Power Generation Specialists are trained to perform all basic lighting tasks, including operating generators. This ability makes them valuable contributors to units that may be cut off or isolated from main electricity sources. 

Understanding various components

Understanding various components
Understanding various components

The responsibilities of the Tactical Power Generation Specialist include understanding the various components that make up a water meter. These components include resistors, capacitors, limit switches, and diodes. The specialist should be able to locate the appropriate resistor that will allow for accurate water flow readings by using knowledge of how voltage affects different electrical conductivity values. The specialist should also be knowledgeable about how to locate and use diodes in order to take meter readings at night when there is no power available. Relays are necessary if there is no power available in order to get signals from other water meters so that accurate reading can be taken for billing purposes.

They also need to understand how to read generator voltage regulators. A voltage regulator is used to control the flow of power through electrical components. It is used to make sure that “electrical signals” are not lost by ensuring that the power output remains constant during fluctuations in electrical distribution. This item should be familiar with military generators and how they work, including the alternator field circuit breaker, overload relay, exciter field current limiter, and exciter field current regulator. The alternator field circuit breaker protects a generator from short-circuiting in external wiring when starting a running engine. Overload relays respond to abnormal operating conditions in AC systems. The exciter field current limiter responds to excessive excitatory field current in AC systems. The exciter field current regulator is the device that controls the amount of excitatory field current with the objective of maintaining a constant source voltage in AC systems.

Preventative maintenance 

 “Mechanical or electrical maintenance of equipment to extend its operational life.” Perform preventative maintenance of all combat power generation systems to ensure they are always in total control before they are put into service.

Preventive maintenance involves the regular inspection and repair of essential equipment, installations, spare parts, tools, and supplies before they wear out. It is one of the effective ways to prevent breakdowns that can result in road or rail blockages or loss of important information. Maintaining an efficient supply system is an important part of this mission. It also plays a vital role in preventing casualties by checking vital supplies for deterioration.

Technical assistance of Electrical equipment

They provide technical assistance and troubleshooting for electrical equipment (power converters, power distribution equipment, etc.) used in generating plants and other installations connected to the commercial power grid or plant auxiliary systems such as cooling or heating systems.

They also obtain electrical power from a non-electrical source, provide support for equipment, troops, and facilities throughout the world. Perform electrical power generation, conversion, and distribution functions to provide continuous Base Operations support.

Tactical situations

They may give advice to commanders on operating generators in tactical situations (forward area refueling station, forward operating base, air traffic control towers, radar sites). May provide technical information on different filters used in connection with field installations (i.e.

Assisting other maintenance areas

Assisting other maintenance areas
Assisting other maintenance areas

Tactical Power Generation Specialists are often put into other jobs where they can use their expertise to help out. This may include construction, road detail, or other assignments which free up troops for combat.”

Career Opportunities

Career Opportunities

Nowadays, there is a shortage of qualified people with the right skills for work in power generation. The U.S. Geological Survey indicates this will skew sharply upward as the world’s population rises and the overall demand for power increases. That’s why employers are offering jobs to those with specialized skill sets such as those listed above. Apart from just getting a job, the career opportunities listed above could also open up other doors to more than just your line of work and provide an opportunity to advance your career or gain new skill sets you need to maneuver through the growing market of power generation professionals.

Diesel Engine Mechanics

Diesel engine mechanics work on the engines of trucks, buses, construction equipment, and locomotives. They inspect engines for damage or defects before they are used again. There may also be occasional work with natural gas engines and other gas turbines engines, such as jet engines and pipeline compressors. These workers maintain power plants, locomotives, ships, naval vessels, farm equipment—basically anything powered by a heavy-duty engine or gas turbine engine.

Electrical Repairs

Repairing electronics often involves working with circuitry and other components that can be dangerous if not handled properly. Electrical repairers need to know how to use tools such as soldering irons and voltmeters to fix connections or swap out wires without damaging sensitive parts. They also install and repair electrical wiring, circuit boards, and other components in communication, navigation, radar, or other systems. 

Electrical Engineering Technicians 

Electrical engineers work in power plants, factories, construction sites, and defense industries. This career involves a lot of paperwork, but most electrical engineering technicians will be involved in the process of testing transformers, building and testing electrical equipment, and developing technical drawings for new machines.

Commercial and Industrial Equipment Repairer

This job maintains the mechanical equipment linked to heating, ventilation, air conditioning (HVAC), refrigeration equipment, fire protection systems, elevators/escalators/moving walkways. They inspect plant equipment for damage or defects so it can be repaired or replaced before it causes service problems or an emergency shutdown of a system. 


Electricians create and maintain electrical circuits, wiring, and electronic equipment. They install electrical wiring, power distribution units, switches, and lighting for both commercial and residential structures. An electrician makes repairs to power distribution systems, equipment distribution systems, indoor wiring, outdoor wiring. Since an electrician has the training to work on all types of electrical equipment, this is a very wide-ranging career that can be very exciting.

Summary of MOS 91D

91D involves tactical power generation. Power generation is the set of mechanisms and processes necessary to move electrical energy from its generation point to a point where it can accommodate the power demands of an electrical load. This MOS encompasses all aspects of tactical power generation, including development, production, delivery, storage, and use. Additionally, these services are required to provide guidance for units on tactical power generation.

This MOS provides opportunities for individuals with experience in all areas of Tactical Power Generation to develop technical skills to meet the growing demand for tactical power generators by developing strategies that are cost-effective and provide optimum performance. This requires planning that addresses potential growth/expansion needs over the next 20 years.


Is 91D a good MOS?

91D is a combat MOS. It is designed for combat infantrymen who want to make the most out of their military occupational skills. The 91D MOS is one of the most demanding and difficult military jobs in the U.S. Army, which makes it one of the most highly sought-after skills among enlisted men and women in today’s military personnel pool. A high level of physical fitness as well as technical skills is demanded. The 91D MOS is one of the Army’s most technologically advanced, as it requires the soldier to be well versed in complex electronic technology, electrical systems, and power sources, as well as having an ability to think on his/her feet and work through tough combat situations.

What is a 91D MOS?

The 91D MOS is a specialty MOS (military occupation specialty) in the United States Army responsible for servicing and repairing all types of tactical power generation systems. These systems provide electricity for gear such as night-vision goggles, radios, computers, and other electronic equipment used by infantrymen during combat operations. It is a highly technical job requiring constant knowledge of the newest technological advances in order to keep abreast of the latest products and how to repair them.

What does a power generation equipment repairer do?

Power generation equipment repairers, or “P-Gears,” as they’re called by fellow servicemen and servicewomen, work closely with soldiers in ground combat units and provide technical support during maneuvers and combat situations. They service and repair tactical power generation systems such as power sources and alternators, which are used by infantrymen. These units provide electricity for the latest technological devices such as night-vision goggles, radios, computers, and cell phones. They’re also responsible for maintaining and operating advanced generators.

How long is Army 91d school?

Army schools are not like regular schools. They’re more like vocational schools where you learn a particular skill set. No hard and fast rules are found on how long it takes to become a Tactical Power Generation Specialist (MOS 91D). Usually, the Basic Combat Training is for ten weeks and ten weeks of Advanced Individual Training.

What is a 91 Charlie?

Army 91D is a MOS within the Quartermaster Corps. The responsibilities for a 91D MOS include working with power generators, transformers, large motors, and generators. They may find themselves installing or repairing these devices in combat zones or during peacetime operations both on and off the post.