As much as I respect your experience, if there are enough of them in the military, there can be more than one with 'hands on the trigger.' I somehow doubt that all nukes once armed can be remotely disarmed. Further, if the Jihadis can take over subsonic passenger planes and fly them into buildings hundreds of miles away before they are shot down, how could you be so confident we can rely to such degree upon procedure?
You make eroneous assumptions regarding “once armed”.
Getting to that point is well protected.