The CDQC often has slots (Unlike HALO school) so the big issue is getting your command to approve the school and getting USAJFKSWCS to give you the waiver to go to the school (needed since you are not an 18 based on your comments). The waiver is tough right now but at times can be done. You can not challenge the course like HALO school you have to complete the entire course. Medics are always in short supply so if you have the desire, apply to SFAS.
As for challenging HALO School, you need to have your class B skydiving license, a HALO Physical, and a waiver from the school house. Once you have those things you go out to Yuma and are briefly trained on military specifics before doing the required jumps. If you make the jumps then you pass the school.
As for challenging HALO School, you need to have your class B skydiving license, a HALO Physical, and a waiver from the school house. Once you have those things you go out to Yuma and are briefly trained on military specifics before doing the required jumps. If you make the jumps then you pass the school.