There are specially-equipped subfleets of C-17s and C-130s available to the Nuclear Airlift Force but that's all I know. Some of the former were used last year to remove HEU from a facility in Scotland.
In the olden days the USAF used to cart weapons around by the dozen, literally, in C-124 transports nicknamed 'Old Shakey', which shows how resilient these devices are.
During the Cold War the Soviet forces used An-22s and Mi-6s for similar missions. The latter would have deployed weapons to the GRU handlers at air-bases immediately prior to use.
In the olden days the USAF used to cart weapons around by the dozen, literally, in C-124 transports nicknamed 'Old Shakey', which shows how resilient these devices are.
During the Cold War the Soviet forces used An-22s and Mi-6s for similar missions. The latter would have deployed weapons to the GRU handlers at air-bases immediately prior to use.