I do not think there is anything wrong working for defence companies. First you need to realise there do not start wars. I wish this was not true but there will never be peace in this world. Consider the amount of conflict or disagreement between family members and people dream of a peaceful world. People are selfish, greedy and there will always be a power struggle. So to say working for a defence company is immoral is just silly to me. The war in Iraq and Afghanistan happened all you who say it was immoral, tell me what you did to help.
All that said many of the defence companies are not entirely focused on military products. For the OP and anyone who is not sure, think of what is best for you and not what people will say
Claims damages because he didn't get a first