US Senator Martha McSally, the first female combat pilot in the US Air Force, said on Wednesday she had been raped by a superior officer but did not report it because she blamed herself and did not trust the system.

"The perpetrators abuse their position of power in profound ways, and in one case I was preyed upon and then raped by a superior officer," Sen McSally, an Arizona Republican, said during a Senate hearing on sexual assault in the military.

"But unlike so many brave survivors, I didn't report being sexually assaulted," she added. "Like so many women and men, I didn't trust the system. I blamed myself. I was ashamed and confused. I thought I was strong but felt powerless."

Sen McSally did not identify her attacker.

Another member of the subcommittee, Democratic Senator Tammy Duckworth who is a retired Army lieutenant colonel and lost both legs in combat in the Iraq war, said the military "has utterly failed at handling sexual assault."