The announcement follows reports, unconfirmed by Beijing, that Defence Minister Dong Jun has been placed under investigation for corruption.
If confirmed, Dong would be the third Chinese defence minister in a row to be probed for graft.
Asked about the report at a regular briefing on Wednesday, Chinese foreign ministry spokeswoman Mao Ning said it was just “chasing shadows”, and did not offer further information.
A former navy commander, he was appointed defence minister in December following the surprise removal of predecessor Li Shangfu just seven months into the job.
Li was later expelled from the ruling Communist Party for offences including suspected bribery, state media said. He has not been seen in public since.
His predecessor, Wei Fenghe, was also kicked out of the party and passed on to prosecutors over alleged corruption.
The country’s secretive Rocket Force – which oversees China’s vast arsenal of strategic missiles, both conventional and nuclear – has come under particularly intense scrutiny.
In July, a top Chinese official in the Rocket Force, Sun Jinming, was placed under investigation for corruption.