(a) Pre-attack: That phase that includes all planning and testing of existing facilities, plans and Emergency Action Procedures. (b) Trans-attack period. From initial attack until civil defense personnel determine that radiation levels permit leaving shelters. Essential functions during this period would include at a minimum all FOA generated Essential War Functions (c) Post-attack period. (1) Immediate phase. Emphasis on recovery, would include: (1.a) Continuing survival activities and military operations. (1.b) Mobilizing military and civilian resources. (1.c) Restoring essential communications and transportation. (1.d) Increasing procurement and production of essential items. Long-term phase. Activities related to rehabilitation, rejuvenation and restructuring from remaining resources". (USACE, Planning and Operations Guidelines, Annex V: Definitions and Common Terms, 1985, p. V-1)