20 combat veterans take their lives each day in America; Jennifer Griffin reports on how the White House is trying to help.

He is one of the 20 combat veterans taking their lives each day -- an epidemic the military and White House are trying to stop.

Staff Sgt Allen Thomas served in the same battalion as Marckesano.

He died by suicide in 2013, leaving behind two daughters and his wife Danica, who was at the White House ceremony in June to launch the President's suicide prevention initiative with The Independence Fund and the Department of Veterans Affairs (VA) Be a Hero for a Hero.

Staff Sgt Allen Thomas and his wife Danica.

(Images courtesy of Danica Thomas).

Staff Sgt Allen Thomas, his wife Danica and their two daughters.

(Images courtesy of Danica Thomas).

Staff Sgt Allen Thomas, his wife Danica and their two daughters.

(Images courtesy of Danica Thomas).

Staff Sgt Allen Thomas, his wife Danica and their two daughters.

(Images courtesy of Danica Thomas).

Staff Sgt Allen Thomas, his wife Danica and their two daughters.

(Images courtesy of Danica Thomas).

Staff Sgt Allen Thomas, his wife Danica and their two daughters.

(Images courtesy of Danica Thomas).

I heard the crack of the gunshot from across the neighborhood,” his wife Danica wrote

Young combat veterans die by suicide at four times the rate of other veterans