Concealment is mandatory to success. All litter and other evidences of boobytrapping must be removed.
An obvious firing assembly may distract attention from a cunningly-hidden one.
C. LIKELY AREAS
Defiles or other constricted areas are excellent locations.
Road blocks, fallen trees, litter, etc., are ideal locations.
E. GATHERING PLACES
In buildings, at building entrances, and in similar places where soldiers may move or gather, delay charges pay off.
F. APPEAL TO CURIOSITY
Boobytraps laid in bold positions to dare the curious get results.
Dummy boobytraps, consistently repeated, may encourage carelessness. An obvious boobytrap may mask another and perhaps a more deadly one.
Boobytraps may be baited. The unexpected detonation of a delay action incendiary or explosive boobytrap may scatter troops or detour them into a more heavily laid area.
— BOOBYTRAPS, Department of the Army Field Manual No. 5-31 (Headquarters, Department of the Army, September 1965)