[2] Marks joined the U.S. Army in July 2008 aged 17 and earned the military occupational specialty 68W, Health Care Specialist.

Marks, then known by her married name Elizabeth Wasil, recovered from her injuries, first in Germany,[2] then at Brooke Army Medical Center (BAMC) at Fort Sam Houston in San Antonio, Texas.

She began swimming as way to complete additional physical therapy and cardio while at BAMC and obtained the fit for duty classification on July 3, 2012.

[1] Marks began competing in swimming competitions shortly after joining the U.S. Army World Class Athlete Program in July 2012.

[1] In 2014, during the 2014 Invictus Games, she contracted a severe respiratory infection, which forced doctors at Papworth Hospital, United Kingdom to place her in a medically induced coma for one month.