[1][3] Webster assumed command of the Third Army/Army Central on May 9, 2009 from Lieutenant General James J. Lovelace and during his tenure was responsible for moving the Third Army's headquarters from Fort McPherson, where it had resided for 62 years, to Shaw Air Force Base in 2011.

From 1974 to 1978, Webster served as a Platoon Leader, Executive Officer and Company Commander in the 5th Infantry Division at Fort Polk.

From 1993 to 1994, he served as the Armor Task Force Trainer at the United States Army National Training Center in Fort Irwin.

During the buildup in Kuwait and attack into Iraq from 2002 to 2003, he was Deputy Commanding General of Third Army and all ground forces for Operation Iraqi Freedom.

[citation needed] As the Commander of the 3rd Infantry Division from 2003 to 2006, Webster returned his unit from combat, reorganized and trained it, and redeployed it into Baghdad.