COL Diep graduated from the United States Military Academy (USMA) and was commissioned as an Adjutant General Corps Officer in 1999.  Her operational assignments include duties as a company commander and battalion operations officer with the 3^rd Personnel Services Battalion, 3rd Infantry Division at Fort Stewart, Georgia.  After the Captain’s Career Course, Khanh served as the logistics officer for the 3rd Personnel Group at Fort Hood, TX, and later had the opportunity for a second company command in the 502nd Personnel Services Battalion.  COL Diep was the senior human resources officer (S1) for the 1st Armored Brigade Combat Team (1ABCT), 1st Cavalry Division and the Division G1 for the 4th Infantry Division, Fort Carson, Colorado. 

Her deployments include Stabilization Force (SFOR) 9 in Bosnia (2000-01), Operation Iraqi Freedom (2003-04) and Operation Enduring Freedom (2011-12).

Between operational assignments, COL Diep was an instructor in the Department of Physical Education (DPE) and served as the Deputy G1 at the United States Military Academy (2006-10). She was an interagency fellow with the Department of Veterans Affairs from 2013-2014 before assuming duties as the Executive Outreach Officer for the 38th Chief of Staff of the Army.

In addition to her bachelor’s degree in French from West Point, she has master’s degrees in Human Resources (Webster), Kinesiology (TX A&M), and National Security and Resourcing from the Eisenhower School, National Defense University.

She has been married to her husband, COL Chad R. Foster, for more than 21 years.  They are both slated for their upcoming 0-6 commands at Fort Hood, Texas. They have one son, Bryce (11).