1 8 ▁death s ▁Category : Un ited ▁States ▁Army ▁gener als ▁Category : Un ited ▁States ▁Military ▁Academy ▁al umn i ▁Category : Pe ople ▁from ▁Jones ▁County , ▁Texas ▁Category : American ▁military ▁personnel ▁of ▁the ▁Indian ▁Wars <0x0A> </s> ▁T act ical ▁speed ▁is ▁the ▁highest ▁speed ▁of ▁a ▁sub marine ▁at ▁which ▁the ▁boat ▁is ▁quiet ▁enough ▁for ▁detect ing ▁other ▁ships . ▁ ▁T act ical ▁speed ▁is ▁limited ▁by ▁the ▁ac oust ic ▁noise ▁generated ▁by ▁the ▁ship ▁itself , ▁which ▁affect s ▁the ▁ability ▁to ▁detect ▁external ▁sources ▁of ▁sound . ▁One ▁of ▁the ▁main ▁contrib utors ▁to ▁internal ▁sources ▁of ▁noise ▁is ▁the ▁prop ulsion ▁system . ▁ ▁T act ical ▁speed ▁for ▁modern ▁sub mar ines ▁with ▁nuclear ▁prop ulsion ▁is ▁at ▁the ▁level ▁of ▁ 8 – 1 3 ▁kn ots , ▁but ▁the ▁new est ▁ships ▁of ▁IV ▁generation ▁can ▁achieve ▁tact ical ▁spe eds ▁over ▁ 2 0 ▁kn ots . ▁ ▁The ▁actual ▁maximum ▁speed ▁of ▁a ▁sub marine ▁can ▁be ▁much ▁greater ▁than ▁its ▁tact ical ▁speed . ▁For ▁instance , ▁the ▁maximum ▁speed ▁( when ▁sub mer ged ) ▁of ▁USS ▁Sc r anton ▁( SSN - 7 5 6 ) ▁is ▁ 3 3 ▁kn ots , ▁whereas ▁its ▁tact ical ▁speed ▁is ▁only ▁ 1 2 ▁kn ots . ▁ ▁References ▁▁ ▁Norman ▁Pol mar : ▁Cold ▁War ▁Sub mar ines , ▁The ▁Design ▁and ▁Const ruction ▁of ▁U . S . ▁and ▁Soviet ▁Sub mar