instruction on excreta and waste disposal problems, improvisation in the field, operation and maintenance of facilities, selection of disposal sites, etc. use of training aids included: tf 8-1174 "disposal of human waste", blackboard; sanitation models (table size), latrine box, pail latrine, barrel latrine, trough urinal, pipe urinal, sewage ditches; flush toilets, tip buckets, automatic siphon; imhoff tank, septic tank.