The Air Force announced Wednesday that it is launching a bug bounty for several of its public-facing websites, allowing hackers to seek out security vulnerabilities in the sites in exchange for monetary compensation.

This follows the successful launch of Hack the Pentagon last April, which was the government’s first attempt at bug bounty challenges, and Hack the Army competition, which was launched in November of 2016.

The bug bounty challenge by the Air Force adds a new twist to the idea of military bug bounties in the United States. For the first time, white hat hackers from the U.K., Australia, Canada and New Zealand will be allowed to participate in the program.

The Air Force bug bounty program will be administered by HackerOne.