The U.S. Strategic Command on Monday apologized for a New Year's Eve tweet joking about dropping bombs.

"#TimesSquare tradition rings in the #NewYear by dropping the big ball...if ever needed, we are #ready to drop something much, much bigger," the U.S. Strategic Command's official account had tweeted earlier in the day.

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Accompanying the tweet was video showing the dropping of "a pair of conventional Massive Ordnance Penetrators (MOP) at a test range," a spokesman told NBC News.

MOPs are 30,000-pound bombs meant for hitting underground bunkers.

U.S. Strategic Command said in a subsequent tweet Monday that the earlier message was in "poor taste."