In 1999, about 34 GAFE defectors were recruited to join the Gulf Cartel, serving as the cartel's armed wing - which became known as Los Zetas. This group also recruited national and foreign military personnel (like U.S. Army soldiers and Guatemalan Kaibiles), corrupt police officers and street gang members, and used their knowledge of torture and psychological warfare to terrorize their rivals and innocent civilians alike. By 2011 only 10 of the original 34 zetas remained fugitives. Most of them have been killed or captured by Mexican Army, Federal Police and the Special Forces Corps.