Will he lose his VA benefits forever or will he be able to get it back when he gets later in the future?

My husband has been out of the USMC almost a year and he is wanting to go back in but in a different branch. The question is, he is getting VA benefits and we are wanting to know if he rejoins the serivce can he lose his VA benefit forever or can he get them back when he gets out in the future? Please help answer this question cause he miss' the military life. He served 8 years and wants to get back in cause thats all he knows. His getting 70% on his VA but his in awesome health and his 28.