Working in Western defence companies

Assalamu Alaikum wa rahmatullah wa barakatuh.

I am to start studying Aerospace systems engineering in the UK in september Inshallah and am currently on a foundation programme there leading directly to it.I would like to know your view on working with defence companies such as Lockheed Marting and BAE systems so as to gain knowledge that would be useful for the defence needs of the Ummah.

Bissalam