Hi. A scenario...
XO: Captain, for some unexplained reason a D-5 out of tube 18 just launched!
Captain: WTF!
XO: Sir, we are tracking the telemetry, and the missile has past the Fail Safe point.
Captain: WTF! We’re is the missile headed?
XO: Appears to be the city of Qom, Sir.
Captain: In Iran?
XO: Yes Sir.
Captain: What are the warheads dialed up to?
XO: About 250 kt each Sir.
Captain: no need to inform JCS or the President. Let’s see what happens.
5.56mm
Sounds good to me...