Last week, DARA dismissed claims that 1, 500 jobs could go at RAF St Athan.
The Ministry of Defence has sidestepped calls to clarify the future of RAF St Athan.
Meanwhile, one military expert told BBC Wales that St Athan had come out well from the defence announcement.
He explained that housing the Signals regiment at St Athan fitted in with the strategy of regional concentration.
BBC: Cawdor barracks to shut with 600 troops moving to St Athan
The purchase of Ministry of Defence land at St Athan, near Cardiff paves the way for jet repair units providing thousands of highly-skilled jobs.
Staff working for the Defence Aviation Repair Agency (Dara), including many from RAF St Athan in south Wales, will rally in central London on Wednesday.
BBC: Five hundred jobs are being cut at the jet repair centre
On the roads, fire crews have been called to deal with localised flooding at Llantwit Major, St Athan and Boverton in the Vale of Glamorgan.
BBC: Flooding: Heavy rain could spark more floods, agency warns
Armed Forces Minister John Spellar said it was not possible to estimate the cost of re-locating the Defence Aviation Repair Agency (DARA) from St Athan.
Pte James, who is based at the Ministry of Defence barracks in St Athan, Barry, in the Vale of Glamorgan, called the emergency services when Theo collapsed.
Mr Hammond said the Ministry of Defence (MoD) was working with the Welsh government to maximise the use of St Athan, while the MoD will dispose of the Cawdor site.
BBC: Cawdor barracks to shut with 600 troops moving to St Athan
Welsh Assembly Economic Development and Transport Minister Andrew Davies, said on Monday the land deal marked "a huge leap forward" in the drive to develop an aerospace centre of excellence at the St Athan site.
Following a high-level review, they have decided to service and repair planes at existing RAF bases with immediate effect - going against original plans to send them to Dara's planned aviation park at St Athan.
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