A new review from a congressionally appointed commission on national defense warned that the US not prepared for war against China or Russia, let alone both at the same time.US Navy photo by Petty Officer 2nd Class Jordan JenningsA new formal review warned that US munitions may last only a few weeks in a war with China.Some important weapons, like anti-ship missiles, may only last a few days, the 114-page report warned.Published by a congressionally appointed commission, the review warned of deficiencies across the board.A new high-profile report on US national defense acknowledged that the Pentagon could deplete its munitions within "three to four weeks" in a protracted war with China.The 114-page report, published on Monday by a bipartisan commission appointed by Congress, warned urgently that the US is unprepared for a sustained conflict with China or Russia, much less both at the same time.Many of its assessments were based on previously reported material.