It's been an incredible year for the Defense Secretary. Here's a look back at some of Chuck Hagel's defining moments at the Pentagon:

• Obama’s Pick For Secretary of Defense Under Fire For Connection To ‘E-4 Mafia’

• Controversial Views Hold Up Hagel Confirmation, Favors Negotiations, Having Reasons To Fight War

• Drunken Secretary Hagel Asks Deputy To Cover For Him At Pentagon Formation

• Defense Secretary Put On Restriction For Taking Duty Van On Late Night Beer Run

• Obama Weighs Intervention After Secretary Hagel Crosses ‘Drunk-In-Public’ Red Line

• Report: Solution To Syria Chemical Weapons Crisis Result Of Drug And Alcohol Bender

• Defense Secretary Hagel Blows Remaining FY13 Budget On Hard Rock Cafe ‘Rager’