What is the worst thing you have ever eaten that has been served up in the chow hall?

A tuna sandwich that was clearly stored someplace wet, with brown limp lettuce. Or a burger that was cooked so long that it was crispy, the whole way through, on a bun so dry that it sucked all the moisture from your brain. Unfortunately in both cases we had come from field so hungry that there wasn't enough time to find a stray, worm ridden, diseased, gangrenous cat to cook and eat instead.

DaNang Army mess hall when I was in transit for R&R. Green scrambled eggs, rubbery bacon, limp wet toast, and coffee that tasted like soap. I can usually eat anything, but I left that breakfast behind.

Not so much food, but milk. I poured myself a glass of milk and almost threw up. I opened up the dispenser and saw the milk was in this plastic bag. The date was 4 months expired. Immediately brought it up the the staff. To this day, I can't really drink milk anymore.