In closed-door meetings, Vice President JD Vance has repeatedly questioned Pentagon assessments of the war with Iran, particularly claims that U.S. missile stockpiles remain strong, raising concerns about the accuracy of information being presented, according to The Atlantic.

He has warned that depleted munitions could undermine U.S. readiness for potential conflicts involving Taiwan, South Korea, or Europe.

A former official says Secretary of War Pete Hegseth tends to align his messaging with what President Trump wants to hear, as his position appears increasingly tied to Trump’s support.

While Hegseth and military leaders maintain that supplies are “robust” and the campaign successful, internal evaluations suggest Iran retains much of its military capability and that U.S. forces have used a significant share of key weapons.

Vance has stopped short of accusing Pentagon officials of misleading the president but continues to push for more accurate and transparent assessments.
This is from The Atlantic so I'm doubting it until someone else verifies it.