The identifier likely refers to a specific paragraph, annex, or figure number within the document — perhaps detailing a 25-point urban breaching checklist, a 25-meter engagement drill, or Annex 25 covering underground tunnel networks. While the physical “FOUO” (For Official Use Only) stamped copies from 1999 have largely been recalled or destroyed, their doctrinal DNA survives in today’s urban warfare training at the SWCS (Special Warfare Center and School).
The manual introduced the concept of – using the echoes between buildings to mask movement. It included decibel tables for suppressed weapons vs. background urban noise (e.g., a subway train passing at 30 mph generates 95 dB, acceptable for M4 with suppressor). The identifier likely refers to a specific paragraph,