primary sector of fire

primary (fire) position

secondary fire sector

secondary sector of fire

emergency sector of fire

sector without fire

sector of fire

fire sector

fire-support sector

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 position

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