▁are ▁categor ized ▁by ▁level ▁of ▁read iness . ▁The ▁three ▁levels ▁are : ▁▁ ▁Active ▁Service : ▁fully ▁oper ational , ▁connected ▁to ▁a ▁delivery ▁system , ▁and ▁available ▁for ▁immediate ▁use ▁( e . g ., ▁IC B M ▁sil os ▁and ▁ball istic ▁miss ile ▁sub mar ines ) ▁ ▁H edge ▁Stock p ile : ▁fully ▁oper ational , ▁but ▁kept ▁in ▁storage ; ▁available ▁within ▁minutes ▁or ▁hours ; ▁not ▁connected ▁to ▁delivery ▁systems , ▁but ▁delivery ▁systems ▁are ▁available ▁( e . g ., ▁miss ile ▁and ▁bomb ▁stock p iles ▁kept ▁at ▁various ▁Air ▁Force ▁bases ) ▁ ▁In active ▁Reserve : ▁not ▁in ▁oper ational ▁condition ▁and / or ▁do ▁not ▁have ▁immediately ▁available ▁delivery ▁systems , ▁but ▁can ▁be ▁made ▁ready ▁if ▁needed . ▁ ▁In ▁ 2 0 0 4 , ▁the ▁stock p ile ▁included ▁ 5 , 8 8 6 ▁strateg ic ▁war head s ▁and ▁ 1 , 1 2 0 ▁tact ical ▁weapons . ▁The ▁strateg ic ▁weapons ▁included ▁ 1 , 4 9 0 ▁IC B M ▁war head s , ▁ 2 , 7 3 6 ▁sub marine - launch ed ▁ball istic ▁miss ile ▁war head s , ▁ 1 , 6 6 0 ▁bom ber ▁weapons ▁such ▁as ▁strateg ic ▁B 6 1 ▁and ▁B 8 3 ▁gravity ▁bomb s , ▁AG M - 8 6 ▁A LC M ▁and ▁several ▁hundred ▁spare ▁war head s . ▁The ▁tact ical ▁weapons ▁consist ▁of ▁ 8