day helicopter landing zone

day-to-day forces support

air combat capable helicopter / air-to-air capable helicopter

day-sight (day sight)

day-to-day issue

ambulance helicopter / medical evacuation (MEDEVAC) helicopter

medical evacuation (MEDEVAC) helicopter / ambulance helicopter

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

helicopter landing deck

landing platform (helicopter)

grid zone / grid-zone

zone standard time (zone time) (ZST)

killing zone / kill zone

grid zone designation / Grid Zone Designator

grey-zone / grey zone (international relations)

hundred-per-cent zone (one-hundred-per-cent zone)

no-fire zone / no fire zone

flight restriction zone / flight restricted zone (FRZ)

fuselage and landing gear clearance zone

landing zone (LZ)

multiple airhead / landing zone

hot landing zone (hot LZ)

assault helicopter company / troop

assault support helicopter battalion

attack helicopter (atk hel)

attack helicopter troop

captain of the day

cargo helicopter

C-day

day of supply (DOS)

D-Day

E-day

G-day