Earlier job losses affected tank maintenance in Telford
Defence giant BAE Systems plans to cut 642 UK jobs over the next two years because of a downturn in its workload.
The jobs will go at eight sites across the UK in its Integrated System Technologies Business, which produces surveillance and command systems.
The sites affected are Portsmouth, Chelmsford, Christchurch, Isle of Wight, Filton, Frimley (Surrey), Hillend (Fife) and south-west London.
Unions expressed "serious concerns" over the loss of skilled jobs.
BAE Systems has made a number of job cut announcements this year because of a lack of future contracts.
JOB CUTS BREAKDOWN
Broadoak, Portsmouth: 220
Chelmsford, Essex: 86
Christchurch, Dorset: 23
Cowes, Isle of Wight: 125
Filton, Bristol: 10
Frimley, Surrey: 99
Hillend, Fife: 52
New Malden, Surrey: 22
In September, it said 1,115 jobs would go in its military aircraft unit. That followed an announcement in April that 500 jobs would go from its combat vehicles and weapons division.
The systems business affected in the latest announcement employs 3,700 workers at 11 sites across the UK.
"We have a responsibility to address a reduction in our forecast workload and manage our cost base to remain competitive and meet our customers' future requirements," said BAE Systems' Rory Fisher.
"We will work with our employees and their representatives to explore ways of mitigating these potential job losses and we will ensure employees are fully supported throughout this process."
The Confederation of Shipbuilding and Engineering Unions expressed its concern.
"The staff at Insyte produce cutting edge technology, these are highly skilled jobs which the UK can not afford to lose," said general secretary Hugh Scullion.
BAE employs 105,000 people worldwide, with 32,600 of those based in the UK at a total of 80 sites.