On February 15, 2018, the NRC issued a Notice of Violation to the Department of Defense, Defense Threat Reduction Agency (DTRA), for a Severity Level III problem related to three violations. The violations involved the failure to: 1) control and maintain constant surveillance of licensed material that was in a controlled or unrestricted area and that was not in storage as required by 10 CFR 20.1802; 2) properly secure a package against shifting during transportation as required by 10 CFR 71.5(a); and (3) use the required shipping paper and a properly marked shipping container in accordance with 10 CFR 71.5. Specifically, on August 2, 2017, an employee of DTRA, placed a licensed source on the roof of a car and inadvertently drove away without retrieving the source, which fell from the roof and was lost. The source was neither attached to the car nor secured within the car and did not comply with the applicable DOT requirements. The source was subsequently recovered on August 3, 2017.