Here is the position description for this position:
Unlike many of the positions posted on this site, this is NOT a nominative position. What does that mean? It means that nominations are not going through your Specialty Leader to BUMED. If you are interested in this one, you can just contact your Detailer and Specialty Leader.
There are no rank requirements or timelines I’m aware of for this position. You just have to be in SoCal or eligible to take orders there.