Captain Greening was commissioned a Second Lieutenant in the United States Army Field Artillery on 29 January 2004. Captain Greening holds a Bachelors of Arts degree in Sociology from Towson State University, Maryland and a Masters in Criminal Justice from the Florida Metropolitan University.
Captain Greening was initially assigned to the 2nd Infantry Division in the Republic of Korea as a Platoon Leader for the 6th Battalion, 37th Field Artillery MLRS. In October 2005, Captain Greening began his tour with the 4th Brigade 1st Cavalry Division at Fort Bliss, Texas as a Firing Support Officer for the 2nd Battalion, 7th Cavalry Regiment “Gary Owen”. Captain Greening then deployed to Iraq with the 5th Battalion 82nd Field Artillery as a Platoon leader in support of Operation Iraqi Freedom from October 2007 to December 2008 during “The Surge”. While in OIF 06-07, Captain Greening would later assume duties as the Brigade Assistant S3 Training Officer. After redeployment in May 2008 Captain Greening attended the Military Police Captains Career Course at Fort Leonard Wood, Missouri from May 2008 to October 2008, after which he was assigned to the 1st Calvary Division Headquarters Fire Support Element (FSE). Captain Greening would deploy to Iraq again with the 1st Cavalry Division FSE in support of Operation Iraqi Freedom from January 2009 to January 2010. While during OIF 09-10, Captain Greening assumed the duties as the Division Assistant Fire Support Officer for Targeting and Division Operation Center (DOC) FSE Battle Major.
Captain Greening military schools include Infantry Basic and advanced training, the Field Artillery Officer Basic Course, and the Military Police Captain’s Career Course and Joint Fires Course. Captain Greening’s awards and decorations include the Bronze Star Medal, the Army Commendation Medal, the Army Achievement Medal, the National Defense Service Medal, the Iraq Campaign Medal, the Korea Defense Service Medal, the Global War on Terrorism Service Medal, the Army Service Ribbon, and the Overseas Service Ribbon.