One of the Star Wars challenges in Fortnite Chapter 4 Season 2 requires you to visit clone trooper checkpoints.
If you're looking to complete this quest, well, all you have to do is head to the Clone Trooper Checkpoints. To have a precise location of these checkpoints, you can check out the following map. Please note that in these three places, you are going to be able to find chests which contain a DC-15 blaster rifle.
After going to these three locations, you will have completed this fairly simple quest.