The court-martial, scheduled for May after several delays, was postponed earlier this month for coronavirus concerns.
Dr. John Giacomini is accused of sexually assaulting another doctor in his department.
Wisconsin National Guard spokesman Joe Trovato said the Guard takes reprisal complaints seriously.
Third Class Midshipman Nixon Keago was charged in October.
Reports of sexual assault and sexual harassment continue to rise in the U.S. military.
Currently, about half the student body are member of the Cadets Against Sexual Assault club.
The Air Force Academy withdrew Pablo Velarde's enrollment before the trial.
The Wisconsin National Guard's new leader inherits a command that was rocked by a scathing sexual assault scandal.
The group wants to remove prosecutorial authority from the chain of command.
A public hearing is planned for April 16 and the court-marshal trial is set for May 7-22.