In 2007 the Mayor of Camp Slayer, Iraq opened a contest for all Soldiers stationed in Iraq for the design of the Camp Slayer Mayor Cell challenge coin. Donateko looked for inspiration in the streets of Baghdad and used a photograph he exposed to land the winning design.
"A challenge coin is a small coin or medallion (usually military), bearing an organization’s insignia or emblem and carried by the organization’s members. Traditionally, they are given to prove membership when challenged and to enhance morale. In addition, they are also collected by service members. In practice, challenge coins are normally presented by unit commanders in recognition of special achievement by a member of the unit. They are also exchanged in recognition of visits to an organization." - GlobalSecurity.org. Retrieved 10 March 2008