The case marks the latest black mark against drill sergeants or drill instructors in the US military, where trainees have little power as they transition into service life.
Most recently, the Marine Corps has faced a spate of allegations of hazing and abuse at the service's boot camp at Parris Island, South Carolina. The cases include allegations of a drill instructor ordering a recruit into an industrial-size clothes dryer and turning it on, and another in which a recruit was ordered to perform exercises on a bleach-covered floor and ultimately needed skin grafts.
In 2015, an Army drill sergeant at Fort Leonard Wood in Missouri was convicted of sexually assaulting numerous female trainees. The service ultimately found that some of the drill sergeant's peers were aware of sexual misconduct but decided not to report it.
The Air Force faced a sprawling sexual assault scandal at its training centre at Lackland Air Force Base in San Antonio that began in 2009 and came to light in 2011. Dozens of drill sergeants ultimately faced court-martial for illegal sexual contact with trainees, including sexual assault and inappropriate consensual sexual relationships.
Another scandal with similarities erupted at the Army's Aberdeen Proving Ground in Maryland in 1996. Several drill instructors ultimately were convicted of rape, while others were convicted of lesser sex crimes, disciplined and discharged.