Retired Marine Cpl. Nick Gervasoni at work with his dog Penny in February 2015. Gervasoni works at Veterans Curation Program in Alexandria, Va. (Meredith Tibbetts/Stars and Stripes)

Retired Marine Cpl. Nick Gervasoni poses with his dog Penny in February 2015. (Meredith Tibbetts/Stars and Stripes)

Retired Marine Cpl. Nick Gervasoni poses with his dog Penny in February 2015, at his place of employment in Alexandria, Va.: Veterans Curation Program. (Meredith Tibbetts/Stars and Stripes)

Retired Marine Cpl. Nick Gervasoni shows how his service dog Penny turns on and off the lights where he works - Veterans Curation Program in Alexandria, Va. - in February 2015. (Meredith Tibbetts/Stars and Stripes)

Derek, a dog-in-training at the Warrior Canine Connection in Maryland and part of the Honor Litter, plays with puppy Quail in February 2015. (Meredith Tibbetts/Stars and Stripes)

Ron, left, a therapy dog and former student at Warrior Canine Connection, gets checked out by a new puppy, Quail, at the nonprofit in February 2015. (Meredith Tibbetts/Stars and Stripes)

Ron, a therapy dog, performs a "War Cry" with his owner Ret. Capt. Bob Koffman, as puppy Quail checks him out. (Meredith Tibbetts/Stars and Stripes)

Dogs-in-training Annie, bottom, and Quail play wrestle at the Warrior Canine Connection in Maryland in February 2015. (Meredith Tibbetts/Stars and Stripes)

Quail, a new puppy at Warrior Canine Connection, rests his paw on therapy dog Ron's head in February 2015 as he looks out the window. (Meredith Tibbetts/Stars and Stripes)

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Ron, a therapy dog, waits for his owner, Ret. Capt. Bob Koffman, to throw a toy outside Warrior Canine Connection in Maryland in February 2015. (Meredith Tibbetts/Stars and Stripes)

Ret. Capt. Bob Koffman throws a toy to dogs outside the Warrior Canine Connection in Maryland in February 2015. The dogs, from left to right, are Olive, Derek, Ron and Huff. Huff is Ron's father. (Meredith Tibbetts/Stars and Stripes)

Dogs play outside the Warrior Canine Connection in Maryland in February 2015. Running towards the frame, from left to right, is Derek, Olive, Ron and Huff. (Meredith Tibbetts/Stars and Stripes)

Dogs play outside the Warrior Canine Connection in Maryland in February 2015. (Meredith Tibbetts/Stars and Stripes)

Huff, a dog at Warrior Canine Connection, plays outside the nonprofit in Maryland in February 2015. (Meredith Tibbetts/Stars and Stripes)

Warrior Canine Connection dogs play in the snow outside the nonprofit in February 2015. The dogs, left to right, are Olive, Huff and Ron. Huff is Ron's father. (Meredith Tibbetts/Stars and Stripes)

Warrior Canine Connection dogs play outside the nonprofit in February 2015. (Meredith Tibbetts/Stars and Stripes)

Quail, a new puppy at the Warrior Canine Connection, crawls under an unused wheel chair in February 2015. (Meredith Tibbetts/Stars and Stripes)