So i'm playing through Chris's chapters when i have the time to play these days and something funny occurred to me, Chris is some kind of crazy time traveling psychic!
Chapter 2 has Chris "remembering" (this is just a flimsy framing device to mask his supernatural powers) losing his squad a few years earlier. Now Capcom would have succeeded in pulling the wool over our collective eyes if not for their one crucial mistake, the shot gun.
Chris kneels down at the end of Chap 1 armed with nothing more then his machine gun, hand gun and knife (in terms of non consumable weapons) remembers picking up a shot gun 2 years prior (Chap 2) and then stands up back in the present at the start of Chap 3 with said shot gun in his possession!
We're on to you Capcom!