Here is a story about a more modern version of hardtack. From the NY Times March 21, 2006:
"For decades it waited in secret inside the masonry foundations of the Brooklyn Bridge, in a damp, dirty and darkened vault near the East River shoreline of Lower Manhattan: a stockpile of provisions that would allow for basic survival if New York City were devastated by a nuclear attack.
City workers were conducting a regular structural inspection of the bridge last Wednesday when they came across the cold-war-era hoard of water drums, medical supplies, paper blankets, drugs and calorie-packed crackers -- an estimated 352,000 of them, sealed in dozens of watertight metal canisters and, it seems, still edible.
The most numerous items are the boxes of Civil Defense All-Purpose Survival Crackers. Printed in block letters, on each canister, was information about the number of pounds (6.75), the number of crackers per pound (62) and the minimum number of crackers per can (419)."