A military psychologist who treated Bradley Manning said there was no support available for him to cope with his gender identity disorder and that Manning suffered greatly in a "hyper-masculine environment" that was hostile towards gay soldiers.

Captain Michael Worsley, a clinical psychologist, evaluated and treated Manning between December 2009 and May 2010, when Manning was stationed in Iraq.

Worsley told the sentencing hearing at Forte Meade military base that Manning would have been put under considerable stress.

"With little support, and few coping skills, the pressure would have been difficult, to say the least," Worsley said. "It would have been incredible."