Five men have been jailed for more than 30 years after MOD-owned munitions containing explosives were stolen from a freight train in Didcot, Oxfordshire.
Forty anti-tank mines were safely recovered within days of the theft last October. Only highly trained soldiers can use the explosives.
Phillip Yates, Kris Black and David Smith all pleaded guilty to theft and possessing explosives.
Mr Smith failed to attend and a warrant for his arrest has been issued.
Leonard Ash, Michael Hellon and Jason McKee were found guilty of handling stolen goods and possessing explosives.
Ten packages, each containing four mines, were reported stolen shortly after 7:30am on 25th October 2012.
An investigation was launched with counter terrorism officers sent to sites where the train had stopped.
MoD-owned munitions - thought to be anti-tank mines - have been stolen from a freight train travelling from Cumbria to Oxfordshire.
Ten packages, each containing four separate plastic cases, were reported missing on Thursday morning when the train arrived at Didcot.
Seven packages have now been found near a railway line in Warrington, Cheshire - but three are still missing.
Military police and anti-terrorism detectives are reportedly searching for a missing consignment of anti-tank mines which were stolen from a freight train.
The wagon which had been carrying the shipment of munitions was impounded at the railway yard in Didcot, Oxfordshire.
The powerful explosives, owned by the Ministry of Defence, were part of a batch of anti-tank mines being carried from the Defence Munitions base in Longtown, Cumbria and destined for the military port in Marchwood, Southampton, where they were expected to be shipped to Afghanistan.