He is the youngest service member to die from the virus.
A reservist who competed in the 2019 Military World Games in Wuhan, China has become the target of conspiracy theorists.
In late March, calls for volunteers went out to those who had served in medical specialties.
At least one of the services says it's looking for members of the Individual Ready Reserve to come back into the fold.
The Army mobilized 1,275 Reserve medical specialists to reinforce civilian hospitals in areas struggling to handle COVID-19.
A spokesperson said the executive order authorized the action, but "it is not an order to do so."
The Navy and Marine Corps have now canceled most weekend Reserve drills.
Dr. Mark Gebhart 53, was commissioned Wednesday morning into the Army reserves as a lieutenant colonel.
They were activated for operations Noble Eagle, Enduring Freedom, Iraqi Freedom, New Dawn, Inherent Resolve, and Freedom...
After his casket was delicately off-loaded from the plane, his family formed a circle around it.