Repositioning to "A" site on Dust, or likely Dust II, a map in the video game Counter Strike

Dust is a Counter Strike map, it has a bombsite A and a bombsite B.

"Rotating" I find a bit more difficult to describe in a consisce manner. You're going between the places you have to defend whilst keeping watch for enemy players, though it can be used more broadly too... I think.

im assuming it's not video game related and they are rotating A on a stock image of dust