T-4 Atomic Demolition Munition

The T4 was produced in 1957 from recycled W9 fissile components[1] and was in service until 1963, when it was replaced with W30 Tactical Atomic Demolition Munitions and W45 Medium Atomic Demolition Munitions.

[1] An article in the mid-1990s in Soldier of Fortune magazine by a former US Navy Underwater Demolition Team member described the T4 ADM without naming it.

Each component was reportedly heavy enough that it was a full load for one team member.

Reportedly, a major operational issue with planned usage of the T4 was the poor projected success rate of parachuting five team members into hostile territory at sea with a heavy load, having them all land close together, while being sufficiently uninjured to be able to finish transporting the weapon's components and assemble them.

Several practice exercises failed to complete when one or more team members landed too far away or were injured.