I'd like to file for benefits related to this can you tell me what I need to do?
You will have to show that your health problems are causally linked to your contact with certain environmental hazards while serving in the military.
Also, I need to find out about this Medical Care Benefits, he also thinks he got sick because of asbestos besides the weapons, so is that possible?
Yes, there is a possibility he may have had contact with asbestos while working in certain military jobs. Asbestos toxic fibers were once used in many buildings and products.