I have to say, the ALG one looks kinda lame. Maybe texture the recycle symbol to be Rheinland green metal and change the font? Something wide and heavy methinks.
This is the Rheinland flag from the FL FSK, with the levels edited. It scales rather well, and it's easy to make it transparent.
For the Unioners, I suggest something more like a worker's union. A hammer and an oxygen welder perhaps, with a raised fist behind them (currently it seems like a placeholder)
For Republican, a stylised one cargo-section train, the top skewed towards the front and lines behind it (speedy transporting)