Communities across the U.S. are fueling a secondary arms market by giving seized and surrendered guns to disposal services that destroy one part and resell the rest.

On Sale for $2: A Soldier's Act of Heroism, Right Next to Used Books and an Old Toaster Newspaper clips from newspapers.com, illustration by Hrisanthi Pickett of The War Horse.

To determine the guns used by the US Delta Force, 24/7 Wall St. reviewed guns cataloged by Military Factory, an online database of military vehicles, aircraft, and arms.