Military manual · MCRP 12-10B.1
MCRP 12-10B.1, page 330
Military Operations on Urbanized Terrain (MOUT)
Marine Corps Reference Publication: Military Operations on Urbanized Terrain (MOUT)
…The AN/PAQ-4A infrared aiming device is similar to its off-the-shelf laser aiming sight
counterparts, except it is not visible to the naked eye. Infrared pen lights can also be attached
to weapons…