O
oath of allegiance (to the colors)
object with complex spatial configuration
objective rally(ing) point (ORP)
objective rally point / objective rallying point
objects with complex spatial configuration
observation aircraft (O; obsn acft)
observation and fields of fire
observation and surveillance aircraft
observation battalion (Obsn Bn)
observer-target / battery-target factor (factor OT/BT)
observer-target line (OT line)
obstacle clearance altitude (OCL)
obstacle clearance limit (OCL)
obstacle intelligence (OBSTINTEL)
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