Father-of-two Sergeant Mark Foley, 31, was killed in Warcop, Cumbria, while travelling in a military vehicle yesterday.
Paying tribute to her husband, who served with Norfolk-based The Light Dragoons, Kelly Foley said: "He was my soul mate and my best friend, who always made me laugh.
"We will miss him so much."
His commanding officer, Lieutenant Colonel James Senior, said: "Sergeant Foley was an exceptionally talented, battle-hardened soldier who embodied everything that is good about our profession. A consummate professional, he delivered on operations time and time again."
The cause is being examined by the Army's Land Accident Investigation Team.