Police are investigating the theft of a pistol and ammunition from the locker of a soldier who is assigned as a guard at President's House.
Police said the lance corporal was on duty at around 2.30 pm on Wednesday and left his service issued Sig Sauer pistol and 30 rounds of ammunition in a locker in the male dormitory.
When he returned hours later at 6.30 pm and found the locker had been broken into and the pistol and ammunition missing.
Police were called in and several people interviewed.
Belmont police are continuing enquiries.