The Littlest Boy: the U.S. Army's backpack nuke

the device is basicly a core absent the usual delivery system. nuclear isomer munitions were not ready yet so the original plan appears to be boot powered delivery of a fissile core and initiator charge. most spec operators of that calibre had apx5years life span from the time of first deployment so the exposure was considered a non issue. that being said, this approach could be used by the enemy.