However... I just checked out their website and they look legit.
M&E groupThey seem to be an American company. Definitely a defence contractor, they are advertising at a lot of US defense industry job fairs. What usually happens is they are paid by the US Government for every position they fill. So for example they get $60,000 for your slot, they pay you $40,000 and they make $20,000 profit. You are generally liable for your own taxes and medical. Even so, some of these jobs are OK. Get in touch with the company and have a chat with them and have them clarify their side of things.