Tegan served in the U.S. Marine Corps for four years as an aircraft maintenance administration specialist and was trained as a publications librarian. She served in Iraq from April to November of 2008 with a Marine Light Attack Helicopter Squadron. Tegan left the Marines as a sergeant and returned to her home state of Wisconsin in December 2009. She has participated in Storm the Hill 2013 and 2014. Tegan has also led several VetTogethers in Wisconsin and continues to network with IAVA members nationwide.