accidental operation

accidental detonation

accidental discharge

accidental shifting

curve of accidental errors

accidental error

accidental terrain

accidental damage

accidental cover

accidental injuries

accidental objective

accidental engagement

accidental war

accidental death

clandestine operation; covert operation

humanitarian operation; humanitarian relief operation (HUMRO)

PZ operation (pick-up zone operation)

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

aeromobile operation

African Union / United Nations Hybrid operation in Darfur (UNAMID)

air defense operation

air logistic support operation

air operation

airborne and amphibious operation

airborne assault operation

airborne/ amphibious operation

air-land operation

air-landed operation

airmobile operation

alien migration interdiction operation

Alliance operation

allied joint operation

amphibious operation