Rebel Strike Force is a mod changing the regular HL2DM setup into a more on teamplay based game. A player can choose from 8 different classes to fill in a certain role in his team. There currently is only one gametype called "Objective". The idea is that you and your team mates try to complete a given mission while the other team tries to prevent that from happening.
Displayed here are several screenshots of the loadout screen, showing some of our classes.
Turrets and hoppermines are for Combine....
Err... Rebels can reprogram them
Yeah, however they did have a specific skin. It could still work though, I like this idea.