I tried army and marines right after I got outa high school and both told me no because I 6 months before my physical for em I tore my ACL and mcl and I know what you mean about the oilfield I been tryin that after I was told I couldn't volunteer to serve my country and due to the bills I have I can't afford not to have a full time job
Did you have your ACL repaired? If so, by now you should be healed and ready to go. Once it is healed, the military should be a good option.