Army regiments in Wales are set to learn if they will be affected by defence cuts being made across the UK.
Defence Secretary Philip Hammond is due to speak in the Houses of Parliament later detailing the regiments that will be lost or scaled back.
The regular Army will be cut from 102,000 troops to 82,000 by the end of the decade - its lowest level since the Napoleonic Wars.
In Wales the focus will very much be on possible changes to the Royal Welsh, the Welsh Guards and the Queen's Dragoon Guards - also known as the Welsh Cavalry.
Although details are yet to be confirmed, it's believed 2nd Battalion the Royal Welsh could be merged with 1st the Royal Welsh.
It's thought the Queen's Dragoon Guards will avoid the cuts.
It is part of the 2010 Strategic Defence and Security Review (SDSR), which stated savings of £4.6billion must be made at the Ministry of Defence by 2015.
Mr Hammond has said the changes will provide the basis of a smaller, more flexible and agile Army.
But the prospect of losing historic units has caused anguish within the service.
Redundancies have already been made within the Ministry of Defence in the past year and it is likely this is set to continue. There could be many more job losses within the next three years to meet the targets set out in the 2010 review:
The Royal Navy will reduce by around 5,000 personnel
The Army by 7,000
The RAF by 5,000
Civilians by 25,000