Navy SEAL Photo - SEAL with M4
A US Navy SEAL uses his radio during downed pilot extraction operation as part of an exercise.
This SEAL is armed with a 5.56mm MK18 CQBR carbine, an AR-15 variant with a 10-inch barrel.
The MK18 was developed for the SEALs and has been adopted by many other U.S. special operations units such as the Army's Special Forces and the Marine Corps' MSOBs.
Navy SEALs are a U.S. Navy Special Warfare Command component that carry out direct action raids and counter terrorism operations.