D.O. has enlisted in the military for his mandatory service.

On July 1, SM Entertainment took to EXO's official Instagram account to share a set of images featuring the boys all together before his enlistment. D.O. is seen with a military-style shaved head, and in one picture, the members can be seen playfully touching it.

The caption simply reads: "We are one EXO."

Meanwhile, D.O. is the second EXO member to enlist, following fellow vocalist Xiumin.

Check out the full Instagram post below!