OK Go has become famous for their single-shot videos, and their treadmill video for ‘Here It Goes Again' has almost 50 million views on youtube, making it one of the most popular videos ever (just behind the sneezing panda but ahead of that goofy little dick on his way home from the dentist).
Needless to say, following something so famous was gonna be hard. The most obvious way would be to dress like a high school marching band in a field and have the wind and horn section in sniper camouflage. And so that's what they did. It makes a lot of sense if you think about it.