A U.S. Navy commander charged with accepting paid travel, prostitutes and Lady Gaga concert tickets from a Malaysian defense contractor in exchange for classified information pleaded guilty on Thursday to federal corruption charges. Commander Michael Vannak Khem Misiewicz appeared in U.S. District Court in San Diego to answer to charges of conspiracy to commit bribery and bribery of a public official stemming from his involvement in a scandal surrounding a contractor who serviced ships in the Navy's Pacific Fleet.