primary (fire) position

primary position

changeover from travelling position to fire position

primary sector of fire

launching position (missile position)

position and navigation unit / position navigation unit (PNU)

in position / in-position

slant fire; diagonal fire; oblique fire; fire to the oblique

gunner's primary sight (GPS)

officer of primary responsibility

primary arm

primary armament

primary burn

primary control surface

primary high explosive

primary military occupational specialty (MOS)

primary mission

primary reserve

primary target

primary target line (PTL)

primary trainer

primary weapon

primary, alternate, contingency, emergency (PACE)

primary level training (PLT)

primary venturi

primary control surfaces

primary defect

primary cause

primary great circle spherical coordinate system

primary rainbow

primary runway

primary VHF radio

primary failure