Thirty jobs are to go at the operators of a Ministry of Defence (MoD) range at Larkill, in Wiltshire.
QinetiQ, the defence technology company which manages the range, said it had launched a consultation for voluntary redundancies.
It is also looking at how many people can move to other locations.
The firm, which employs 6,000 people in Britain, also announced about 100 job losses last week at its sites in Worcestershire and Hampshire.
QinetiQ is a British company formed from the sell-off of a UK government research agency.
The trade union Prospect said the firm had lost around 800 posts in the last year.
A spokesman for QinetiQ said it would be withdrawing from Larkhill in order to make efficiency savings.
He said: "As the operator of a number of the MoD's ranges under the LTPA (Long Term Partnering Agreement) contract, QinetiQ is required to deliver year on year efficiency savings to the MoD.
"This includes optimising the utilisation of sites it manages under the LTPA.
"There is no unique capability at the QinetiQ-managed MoD Larkhill range and through the proposed rationalisation of the Larkhill range, we will make better use of LTPA facilities and capabilities and ensure value for money for the taxpayer and our MoD customer."