Excerpt from army article on Eunhyuk and Shindong (who are one of the star soldier teams sent for the concerts):

Separately, until the 29th, there are a series of encouragement concerts with 5 hallyu star soldiers (corporals Kim Jaejoong, Lee Sungmin, Jung Yunho, Shin Dong Hee (Shindong) and PFC Lee Hyukjae) taking place, as part of an active strategy to alleviate the military personnels’ fatigue.

Another news article dated April 27 about these concerts:

Starting from April, there have been a series of KPOP star concerts in army camps nationwide for 12 divisions (11 infantry, 1 marines) each with 1 KPOP star for each team dispatched {t/n: so one division, one team} the concert is to cheer on the soldiers and to share their difficulties through conversations with the stars.

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Credits:

kookbang and hankookilbo via naver,
Translated by @snxy: 1 and 2,
Shared by TVXQ! Express