Kristen Stewart trained with Marines for 'Camp X-Ray'

Kristen Stewart has claimed that she was "put through the ringer" by Marines for her new movie 'Camp X-Ray'.

The 23-year-old 'Twilight' star said that she underwent the training because she wanted to her portrayal of an armed guard to be authentic and admitted that she found the experience extremely tough, Contactmusic reported.

Stewart trained with a couple of members of the United States Armed Forces in preparation for her role as an army guard at Guantanamo Bay who befriends a prisoner in 'Camp X-Ray'.