It could be PTSD, but I think the pig/boar is very symbolic. I don't have the mindset of a military man, but my guess is that you are cautious and expecting the worst. The pig could be symbolic for the enemy, since pigs are tied to Muslim beliefs. White and brown could be the Muslim clothing. Being hungry could mean you are wanting or expecting gunfire or an ambush. The fact he didn't die right away could be the symbolism of a never ending war. And the taste could mean that after eating MREs all the time real food is a delicacy.

That's just my take.