FM 3-3 Glossary A ABCA allies - American, British, Canadian, and Australian allies Active defense measures - Measures taken to find and destroy either the munitions or the delivery systems of an NBC attack. ADA - Air defense artillery APC - Armored personnel carriers Arthropods - Group of invertebrate animals that have a jointed body and legs such as insects, arachnids, and crustaceans. AWS - Air weather service C CAT - Cloud arrival time. Used for biological agent calculations. CB - Chemical/biological CDM - Chemical downwind message CET - Cloud exposure time. Used for biological agent calculations. CFA - Covering force area CHEMWARN - Friendly chemical attack warning COMMZ - Communications zone E ECM - Electronic countermeasures ECCM - Electronic counter-countermeasures EW - Electronic warfare F FDC - Fire direction centers FEBA - Forward edge of the battle area PLOT - Forward line of troops FSE - Fire support element FSOP - Field standing operating procedures G GN - Grid north. GMT
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