The Levites are to camp around the Tabernacle of the Testimony, so that there will be no wrath unleashed on the community of Bnei-Yisrael. So the Levites are to maintain care of the Tabernacle of the Testimony.
Then the Tent of Meeting will move out with the camp of the Levites, which is in the middle of the camps—just as they were in camp, each person in his own place under his own appropriate standard.