Ah yes, Joe Brennan, one of BBI's last figures, and came with some awesome kit, and 2 versions in desert tiger Stripes, and the first figure that had Multicam as a lisenced advertising portion on the box. The more exclusive version came with the full Multicam uniform. I love that figure.
Body as noted above, G3.5. There was also a cheap knock off of this head with brown hair and crappier paint apps as well, available in some of the Hong Kong stores on Ebay and online. I bet there are some still kicking around. The one with the red hair is more like the original.
That head is of an actual person, and he was a member here for a while(not sure if he has been on recently). If you look for the original post of that figure, you will see there was some input about it, and some was less than enthusiastic. There was some apologizing made because the individual chimed in, and some folks were called on the unkind comments about the individuals' appearance.