Three soldiers with the 13 Air Assault Support Regiment RLC are to be dismissed after failing drugs tests.
The MoD has a policy of compulsory drug testing
The Ministry of Defence (MoD) said 50 soldiers, based at Colchester Garrison, in Essex, underwent compulsory drug tests on 9 October.
The MoD said in a statement: "In line with the Armed Forces Policy, application will now made to discharge these three individuals."
The incident was not as a result of a drugs raid and no rooms were searched.