Air Marshal removed from duty for taking photos up women's skirts

Air marshals began flying on flights after the September 11, 2001, terrorist attacks.

The TSA has often come under fire for its security techniques in the more than 10 years that have passed since then.

The agency says on its website that air marshals are supposed to “detect, deter, and defeat hostile acts targeting U.S. air carriers, airports, passengers, and crews” during flights.

“Federal Air Marshals must operate independently without backup, and rank among those Federal law enforcement officers that hold the highest standard for handgun accuracy,” the TSA website says of air marshals.

“They blend in with passengers and rely on their training, including investigative techniques, criminal terrorist behavior recognition, firearms proficiency, aircraft specific tactics, and close quarters self-defense measures to protect the flying public.”