The U.S. Army’s $11 million sponsorship with Dwayne ‘The Rock’ Johnson has failed so miserably that the Pentagon is demanding $5 million back from the legendary pro wrestler-turned-actor. RadarOnline.com can reveal the U.S. Army inked the $11 million advertising deal with Johnson, 52, and the United Football League earlier this year in a desperate bid to recruit more soldiers. But the high-profile deal was said to be “so catastrophic” that the army reported losing at least 38 enlistments because the time and money could have been used better elsewhere. The contract required the former WWE star…