Attrition
A great jump to use off the start of the IMC spawn is to wall run off the Cannon Control Room. At the end of the wall, double jump towards the Factory, wall run once again, and then double jump towards the Delivery Building. This will aid in avoiding enemy snipers off the start of the match and is also a great jump to use throughout the match.
Capture the Flag
When running the flag from the Observatory, be sure that Stim is picked for your Tactical Ability. Grab the flag and then immediately jump to the roof. Activate your Stim and jump all the way across into the Armory—Stim is essential to make this jump. You will want to make it inside so you have more cover, so either continue running through the Armory or jump through the breakable glass above it and go around the Bridge area, which provides more cover at the expense of a longer run.
Escaping with the flag inside the Factory can be tricky, but use a few wall runs and zip lines to outwit your opponent. Grab the flag and immediately head up the stairs to the upper catwalks. From here, jump onto the wall to the right and make it to the rooftop of the Factory. Across is a zip line that brings you to the Cannon Control Room. This will confuse the other team because it seems like you are going in the wrong direction to capture the flag. Quickly take the next zip line to your right that leads to the top of the Armory. The opponents will be spinning their heads because of the fast movements used. Check your corners and make your way back to your base with the flag.