Jaster was commissioned as a U.S. Army Engineer Officer in 2000 upon graduation from the United States Military Academy in West Point, New York. She was initially assigned to Fort Stewart in eastern Georgia with the 92nd Engineer Battalion, and deployed in support of the wars in Iraq and Afghanistan in her first four years (Operation Enduring Freedom I and Operation Iraqi Freedom I). Jaster was then reassigned to Fort Leonard Wood, Missouri, for school, where she met her husband, Marine Lt. Col. Allan Jaster. She left active-duty in 2007 and started a family and civilian career with Shell, but returned to the Army as a reservist in 2014. Jaster holds a BS and MS in Civil Engineering.