An operator with a United States Coast Guard (USCG) Maritime Security Response Team (MSRT), covers a stair way with his CQBR carbine during a training mission.
Note the chem-lightglock sticks carried by the MSRT operator.
When crimped, these plastic tubes glow brightly.
Many tactical teams use these as markers to denote areas/rooms that have been cleared.
MSRTs are an elite counter-terrorism unit of the USCG's Deployable Operations Group.
MSRTs are on a reactive posture, ready to respond to maritime terrorism and criminal threats.