OPCON operational control
opn operation
opns scty operations security
ord ordnance
Ord C Ordnance Corps
orgn organization
OS operations support (branch)
OSA Office of the Secretary of the Army
OSB option selection button
OSD office of the Secretary of Defense
PA Public Affairs
PAC personnel and administration center
PAC-3 Patriot Advanced Capability-3
PACAF Pacific Air Forces
PACFLT Pacific Fleet
PACOM US Pacific Command
pantel panoramic telescope
PATRIOT Phased Array Tracking Radar Intercept on Target
PBR river patrol craft
PC coastal patrol craft
pcht parachute
PD point-detonating
perm permanent
pers personnel
PFD primary flight display
PIBD point-initiating base-detonating
PGM precision guided munitions
PGRV precision-guided re-entry vehicle
PHIBGRU amphibious group
phibron amphibious squadron
plat platoon
plat ldr platoon leader
plat sgt platoon sergeant
plt pilot
PMFD primary multifunction display
PO petty officer
POC platoon operations center
POL petroleum, oil and lubricants
pos position
POSNAV inertial position navigation system
POST passive optical seeker technique
POW prisoner of war
PR personnel recovery
pri-fly primary flight control
prim primary
prim msn primary mission
prin principal
proj projectile
prop propeller
prox proximity