The Department of Defense is building a new travel management system with Concur Technologies.

The bug bounty program at the Defense Department exposed more than 100 security vulnerabilities in its travel booking system.

"Assets could include closed networks, software-embedded devices, proprietary source code, or other private or internal systems not generally accessible via the public Internet," a new RFI says.

This time the Pentagon wants hackers to find vulnerabilities in the Defense Travel System's public-facing websites.