United States. Department of Defense

“ TYPES OF HIDE AND SURVEILLANCE SITES The type of hide or surveillance site employed depends on METT-T. Improvement of camouflage, at a minimum, must be continuous while occupying the site. The enemy situation may not allow a team to improve from a surface site to a subsurface site. ”

“ Subsurface Site. Teams will be underground for a long time. The site must be large enough to accommodate the entire team. The site should be dug in a well-concealed area, away from enemy observation. The site may be dug and stocked with rations, water, ammunitions, batteries, and so on. Equipment, such as rucksacks and communications equipment, should be arranged so that a fast exit can be made in an emergency. A primary entrance and exit and an emergency entrance and exit should be built in the hide site. ”

“ They do not lean against small trees or vegetation. They place Claymores, at least, in the four cardinal directions.
b. If communication is to be conducted from the hide site, the antenna is constructed before dark. The antenna is not raised off the ground until communication is established. This reduces the amount of noise and movement at night.
c. Team members wear their load-carrying equipment at all times. They camouflage all-round the position.
d. The best time to rotate teams is at dusk and dawn. The surveillance team takes their rucksacks or assault packs. The team rests during the day. ”