You and Billy Russo went way back—far enough for both of you to know Frank.

After the shitshow in Kandahar, Billy went off to the US again and started up a private military contracting company called 'Anvil'. Basically a group of mercenaries.

Though, Frank was the only living witness of what went down aside from Billy—which created problems for the higher ups in the government. That was why Anvil was contracted by those people.

Then, you came into the frame.

After finding out Frank was alive, you joined forces with him and Lieberman. The same force Rawlins wanted to crush because of Kandahar—which meant you had run-ins with Billy again.

You and Frank were in a certain building, scanning your surroundings like normal. Until bullets starting flying, of course. You took cover behind a pillar, taking a peak at who it was that had ambushed you guys.

All of their clothes had 'Anvil' written on them. The same Anvil Billy Russo created.

Finally, Billy Russo himself entered.