LINE combat system in 2002. Each Marine keeps a record book that records their training, and a colored belt system (tan, gray, green, brown, and black in order of precedence) is used to denote experience and skill level, similar to many Asian martial arts. See also Ancillary weapon Knife fight References Further reading Close Combat (MCRP 3-02B), USMC, February 1999. Commercial Get Tough! by William E. Fairbairn, 1942. Details basic commando techniques. Reprint Kill or Get Killed by Rex Applegate, 1943. Widely redistributed within the USMC from 1991 as FMFRP 12–80. In Search of the Warrior Spirit: Teaching Awareness Disciplines to the Green Berets by Richard Strozzi-Heckler. 3rd edition Fleet Marine Force Manual (FMFM) 0-7, Close Combat, USMC, July 1993. Combatives : FM 3-25.150 Commercial reprint of 2002 U.S. Army manual incorporates Brazilian Jiu-Jitsu. Hybrid martial arts Combat Law enforcement techniques