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.
Here are some screenshots showing one of the maps in RSF and also some game features.
Looks a little too blocky, in half-life 2 the Citatel was very complex complicated looking structure. try adding different textures, props and darker lighting to really make this look great. Thats what i liked about the cititel part in hl2 was the claustrophobic feeling you got being trapped in this maze of wires and machines and here its not really present. I know that detail may not be the primary priority in this early in development but when the time comes that it is this is a suggestion.