Not likely. That's a lot of trouble just to take out an Army Captain wouldn't you say? There is no way anyone could time the bridge catastrophe that close. And besides who dove the car off the bridge? I think it boils down to somebody wanted his documents either the Army or an unfriendly. Either the Army had a tracker located in the car or someone was following him and perhaps saw him go over.
When you take into account that Classified Laden Lap Tops seem to be a hot commidity in the past few years so it's not too far fetched to think he was being followed by someone waiting on a good opertunity to steal or download from one.
If it was indeed the Army who retrieved it they made way too much noise doing so and went through improper channels as I mentioned in my previous post. Protocol would be the State Emergency Management which has a mission to deal with this and other matters.