free-flier operation

вільний політ; нестабілізований політ; пасивний політ (з вимкненим двигуном)

accident-free flying / mishap-free flying

mishap-free flying / accident-free flying

knock-free operation

accident-free operation

failure-free operation

trouble-free operation

clandestine operation; covert operation

humanitarian operation; humanitarian relief operation (HUMRO)

PZ operation (pick-up zone operation)

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

contact-free war

contamination-free

free fall air drop

free naval control of shipping

nuclear-free zone

toxic free area

weapons free zone (WFZ)

anti-aircraft free-flight rocket

free flight rocket

free-flight aerial rocket