A Marine assigned to the 1st Marine Special Operations Battalion (1st MSOB) takes a knee and provides security during a joint US-Afghan operation in Watan Village, Helmand Province, Afghanistan, April 2012.
The Critical Skills Operator (CSO) is armed with a M4a1 carbine fitted with a M203 40mm grenade launcher.
Note the bandolier of 40mm grenades afixed to the Marine's assault webbing.
The M4a1 is also fitted with a SpectrDR scope with RMR top sight, an AN/PEQ-15 laser pointer and a KAC QD suppressorr.