June 29 (Bloomberg) -- Retired U.S. Army General Wesley Clark, an adviser to Democratic presidential candidate Barack Obama, said Republican contender John McCain has oversold his military and national-security experience.

The Arizona senator ``has been a voice on the Senate Armed Services Committee, and he has traveled all over the world, but he hasn't held executive responsibility,'' Clark, one of Obama's chief foreign policy advisers, said on CBS's ``Face the Nation'' program.

Even the squadron in the Navy that McCain commanded ``wasn't a wartime squadron,'' said Clark, who headed the North Atlantic Treaty Organization and was commander of the NATO bombing campaign during the 1999 Kosovo conflict. ``He hasn't been there and ordered the bombs to fall.''

Clark, who unsuccessfully sought the Democratic presidential nomination in 2004, endorsed Senator Hillary Clinton of New York for the Democratic presidential nomination before Obama, 46, became the party's presumptive nominee. The Illinois senator has better judgment on national security issues than McCain, Clark said today.

``I don't think riding in a fighter plane and getting shot down is a qualification to be president,'' Clark said, referring to the incident that led to McCain's being taken prisoner of war in Vietnam. He also said McCain's service as a prisoner made him ``a hero.''

Obama is ``running on his strength of character, on the strengths of his communication skills, on the strengths of his judgment,'' Clark said.