operation and maintenance, Army (OMA)

CIA Office of Military Affairs (OMA)

Army Fuels and Lubricants Working Party (ARMY F&LWP)

Queen's Regulations for the Army and the Royal Army Reserve

depot maintenance (beyond O and I level activities, performed in an industrial-type facility) / D-level maintenance

maintenance, repair and operation (MRO)

green army (regular army as opposed to special forces etc.)

army operation

contingency maintenance / special maintenance

maintenance checks / routine maintenance, scheduled tasks

maintenance idling (periodic running of engine for maintenance purposes)

organizational maintenance (O-level) (day-to-day work that standard airfield maintenance groups perform in support of airfield operations)

routine maintenance / scheduled tasks, maintenance checks

scheduled tasks / routine maintenance, maintenance checks

special maintenance / contingency maintenance

Naval Facilities Engineering Command Technical Publication - Maintenance Operation

maintenance operation

observation and fields of fire, avenues of approach, key and decisive terrain,obstacles, and cover and concealment (OAKOC)

clandestine operation; covert operation

humanitarian operation; humanitarian relief operation (HUMRO)

PZ operation (pick-up zone operation)

noncombatant evacuation operation (NEO); non-combat evacuation operation

army intelligence and security

Army Mobilization and Operations Planning & Execution System (AMOPES)

Assistant Secretary of the Army (Manpower and Reserve Affairs)

US Army Community and Family Support Center

US Army Development and Readiness Command

US Army Medical Materiel and Research Command (USAMRMC)

US Army Training and Doctrine Command (TRADOC)

Army Tactical Command and Control System (ATCCS)

hardened and networked army

Army tactics, techniques, and procedures (ATTP)

Joint Army and Navy Board