Recall chatting with a fellow in my training platoon that had just come from that school - no one really believed that they’d send those out, and no one believed the timer delay garbage either.
iirc, drawing straws was an option.
My understanding was that any of these backpack or suitcase nukes were rendered useless as the fissile material deteriorated fairly quickly.k
They were useless unless used in a very short span of time.