WASHINGTON (AP) — The head of the House Armed Services Committee is urging military leaders to give greater details about how budget cuts will affect national security.

California Republican Rep. Howard P. “Buck” McKeon tellsl the chiefs of America’s armed forces their credibility is “on the line” because the military has so far talked in generalities about the issue. McKeon says that has left unanswered questions about how they will operate in the era of tighter money.

McKeon was holding a hearing on Capitol Hill Wednesday in hopes of getting the heads of the Army, Navy, Air Force and Marines to tell lawmakers exactly what parts of national security they will no longer be able to provide and what risks the cutbacks present.