It appears that Shane Hurlbut, Director of Photography on Terminator Salvation, is the guy behind that awesome Canon5D MK II helmet. He also happens to be the guy Christian Bale went ape shit on during filming.
https://gizmodo.com/hollywood-is-all-over-the-head-mounted-canon5d-mark-ii-5318722
Speaking with planet5D, Hurlbut revealed that the mount was designed for a series of 9 Terminator Salvation webisodes and was later used to film a rollercoaster ride experience video for the Terminator ride at Six Flags Magic Mountain. Needless to say, this might be the best thing to come out of that whole debacle of a film. [planet5d]
https://gizmodo.com/terminator-salvation-review-better-than-t3-but-not-by-5260359
