the Cuerpo Nacional de Policía for two years, and to have at least one of the following skills: expertise in a martial art, scuba diving, being a marksmanship instructor, is an explosives expert and having worked in one of the operative groups the Police has in some province capitals. The trial features both physical fitness and psychological tests. Its physical fitness test includes arm flexions on a bar, vertical jump, an obstacle course, running three kilometers in eleven minutes and a half, fifty meters of freestyle swimming, a strength test, a speed race and the last challenge which tests the candidates' decision-making capacity. On the psychological and intelligence test the mental capabilities of the candidates are checked. Specialization After having passed the access trial, GEO potential members go through a specialization course in Guadalajara which is not passed by all candidates. There are four areas that candidates must master: instrumental, juridical, socio-professional, and police sciences and techniques. Police science and technique features high-speed and off-road driving, lock picking techniques, abseiling and climbing techniques, maneuvers with helicopters, transmissions, explosives and knowledge about terrorist groups. Instrumental area deals with physical aptitudes such as marksmanship, obstacle courses, martial arts, physical fitness, swimming, sniping, diving, and proficiency with motorcycles. The remaining areas are focused on the rights of terrorist groups and exchanging experience with members of similar groups of other countries. Equipment The uniform of the GEO includes: anorak, jacket, sweater, t-shirt, pants, boots and beret. Overalls are used as a complementary clothing piece. During summer, GEO members use a short-sleeved shirt instead of the sweater and the jacket. Aside from their uniform, GEO members use protective gear which features helmets, Bolle Commando protective goggles, balaclava, Draeger gas mask, ballistic vest, Safariland sheaths for SIG P226 and gloves. They also use vision-enhancing devices such as MATIS thermographic cameras, daylight thermographic cameras, binoculars, PalMIr 250 night vision cameras, Philips BM8028A1 binocular night vision goggles, ITT AN/AVS-9 binocular night vision goggles, ITT Pocket F6010 night vision visor and laser rangefinders. To communicate between them they use the Matra SIRDEE (Sistema Integral de Radiodifusión Encriptada del Estado), Motorola MXR-1000 and MXR-2000 models and VHF/UHF portable repeaters. For operations underwater they use other special gear. It includes: neoprene suits, dry suits for dives in contaminated water, "twin-hose" and "single-hose" open-circuit scubas, dive computers, underwater robots for dives up to 200 meters and dive support equipment. The vehicles used