So far, it seems to me you have a situation in search of a plot. ?Which is okay when you're still brainstorming the concept.
If you use narrative strategy #2, then the Big Reveal has got to be a whopper. ?(Like the one at the end of "The Sixth Sense".) Not that it would be part of the logline, of course, but do you have one in mind?
What unique?skill?or knowledge would a soldier, a mere government issued grunt, have that would justify such an elaborate scheme? ?What if, instead, he were a spy for the good guys. ?But the bad guys could?use the "amnesia" to persuade him that he was really a double-agent and now they want to debrief him about a specific operation to obtain crucial information.
And then what's the McGuffin, the crucial information they want from him? ?Again, it's got to be something that justifies such an elaborate scheme. ? I think the logline needs to be more particular on that point. ?Not that it would be revealed in a logline, of course, but do you have a McGuffin?
fwiw