Military manual · MCRP 12-10B.1
MCRP 12-10B.1, page 220
Military Operations on Urbanized Terrain (MOUT)
Marine Corps Reference Publication: Military Operations on Urbanized Terrain (MOUT)
…Advancing/Patrolling Along an Urban Street (Fire Team, Double Column)
(b) Rear Security. The last two Marines in the squad of each column are responsible
for the rear security of each of their formations. They will…