Defence Minister Andrew Robathan has said the latest cuts in the Armed Forces would be the last major tranche of redundancies for the Navy and the RAF.
He said the MOD would "retain the capabilities that our Armed Forces require in order to meet the challenges of the future".
Up to 2,900 Army personnel will be told of their fate today, as will up to 900 members of the RAF and up to 300 from the Royal Navy in the latest tranche of military job cuts.
It will be the second round of redundancies - including a mixture of voluntary and compulsory - resulting from the 2010 Strategic Defence and Security Review.
That included reducing the size of the Army by 7,000, the RAF by 5,000 and the Navy by 5,000.
The first tranche of redundancies, numbering 2,860, were announced last September.
The numbers to be let go tomorrow were announced by the Ministry of Defence in January.
Thousands of soldiers will learn tomorrow that they are to be made redundant as part of the downsizing of the Armed Forces.
Up to 2,900 Army personnel will be told of their fate, as will up to 900 members of the RAF and up to 300 from the Royal Navy in the latest tranche of military job cuts.