Chinese hackers compromised designs for many of the nation’s most advanced weapons systems, according to a secret Pentagon report.

The hacking affected more than two dozen weapons systems, including some used aboard combat aircraft and ships, according to the Washington Post, which first reported the review from the Defense Science Board.

Some critical weapons mentioned in the report include the V-22 Osprey, the F/A-18 and F-22 fighter jets, the Navy’s Aegis missile defense system and their new littoral combat ships.

The report warns that the information gathered by hackers could weaken the effectiveness of these weapons in a future conflict and could accelerate China’s efforts to develop competing weapon systems.

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