What is the best route to become a Flight Nurse in the Army?

My daughter searched for a Reserve Component nursing position a few years ago She had 10+ years in the ANG and was an E5. After getting her BSN she quit the Guard and focused on her nursing career. Completed her MSN and NP. After about 8 years she wanted back in. She talked to medical recruiters from Army Reserve and Guard, Air Force Reserve and Guard, and Navy Reserve. The Navy Reserve offered her the best deal, so she direct commissioned into Navy as an O3. She will be promoted to O5 in a month or so.

My advice to you; talk to medical recruiters from all Services, active and reserve component. Air Force flight nurses are. Mostly in reserve or Guard.

Flight nurses are mostly an AF thing, not that we don't have flight nurses at all. The flight nurse program is held by the AF. Flight medicine is a graduate degree program. That means you have to first commission as a nurse, spend a few years as a nurse, then as a CPT/MAJ apply for the flight nurse program and be more competitive than your other nurse RN peers to get selected. Then you attend the flight nurse program, or LTHET, or a Flight Nurse Masters program on your own dime

The Army has an ASI for Aeromedical Nurse Practitioners which is awarded after a 66P attends the Army Flight Surgeon Course. So, you would have to get an MSN or DNP as an FNP, commission, attend BOLC, then you would be eligible for the course.