A "slider" is a hamburger/cheeseburger. Standard US Navy fare at least weekly on almost any ship (not sure about them submarines, though).
16 1/2 yrs in the Navy and I think the menu has now come close to resembling anything you would expect to have at home. It's been a long time since I've had to have canned milk, although now we have "UHT Milk" which is milk that has been irradiated and lasts for quite some time without refrigeration.
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