source:https://www.soompi.com/2017/06/21/zeas-heechul-enlist-military-today/
ZE:A’s Heechul will officially be enlisting in the army on June 22.
After training at the Nonsan Army Training Center for four weeks, he will be serving his military duty as a social service worker for two years.
Following Minwoo, Taehun, and Kwanghee, Heechul is the fourth ZE:A member to enlist in the army so far.