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.
The Ministry of Defence announced 3,800 job losses in the Armed Forces. Although less than expected, further cuts to the Army are possible.
Thousands of soldiers will learn today that they are to be made redundant as part of the downsizing of the Armed Forces.