Former Ultimate Fighting Championship bantamweight champion Dominick Cruz went on a secret trip to various U.S. military bases around the world, TMZ Sports reports.

His mission? To train service members to fight like a professional mixed martial arts fighter.

"We had to be so careful and so quiet. Everywhere I went, I could not Snapchat anything I was doing or out any social media until after we had left that area. People are after this; it is a very dangerous situation we were in. We flew around on a C-17 all over the world." Cruz said.

Cruz talked about his trip, which was sponsored by the USO, on TMZ Sports, and explained the reality of trading blows with a four-star general. Watch it here: