A full bio has been posted, detailing Gray's fictional life and path to NATO's International Security Force (ISF). Here's an excerpt:
Born the son of a naval analyst and a civilian geologist, Cullen Gray was exposed to travel and the military way of life from his earliest years. After graduating from a military university with an outstanding record, he served active duty special forces before being identified by NATO as a candidate for the Limited Resources Deployment (LRD) program. The LRD initiative was considered part of the New Warfare paradigm, which theorized that costly military operations could be significantly optimized by deployment of elite "troubleshooters" able to leverage only the resources at hand to resolve high-risk or remote field missions with a high rate of success.
SOCOM 4 is scheduled for release later this year. The game was briefly playable at GDC 2010 featuring PlayStation Move motion controls.