Yunho will be the MC at the main stage not just for the opening ceremony but also for the rest of the event for all days, together with actress Choi Songhyun (she used to be a KBS announcer)!

Translated by @rangrang24:

• Yunho as MC at main stage only(#25 on the map). Events at main stage on 10/2~10/6 daily (Ground Forces Festival Q&A)
  [tweet https://twitter.com/0206yhken/status/649049190518026240]
• Every exhibition & program in Ground Forces Festival are for FREE, ppl are allowed to come in Opening Ceremony. 
  Ground Forces Festival official: PROHIBITED to sell festival ticket by agency/tour company etc. Be careful!
  [tweet https://twitter.com/0206yhken/status/649067613755191301]

Translated by @snxy:

• Frm GFF Q&A- appears Yunho will only be MC for the main stage (sched for everyday-circled) venue- #25 on map
  [tweet https://twitter.com/0206yhken/status/649049190518026240]

• Pls note that all e events at GFF are free (for opening ceremony some seats are invitation-only); don’t get scammed.
  [tweet https://twitter.com/0206yhken/status/649067613755191301]
• GFF Q&A- 11th division’s sergeant Kim Dong Ho may also be MC at the main stage (or fringe events)

  

• Min of Nat Def: Announcer-actress Choi Song-Hyun has been chosen to MC (with Yunho) at the 13th GFF on 10/2
  [tweet https://twitter.com/kor_celebrities/status/649129785466089472]
• Choi Song-Hyun & Yunho’ll be MCs at the opening ceremony. Yunho’ll also be main MC for (the rest of the) event http://www.tvreport.co.kr/?c=news&m=newsview&idx=794236 …

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Credits:

Ground Forces Festival homepage Q&A: 1 and 2 (via @0206yhken: 1 and 2) and 3 (via @snxy),
Also @kor_celebrities and TV Report,
Translated by @snxy : 1, 2, 3, 4 and 5,
Also Translated by @rangrang24: 1, 2 and 3,
Compiled and Shared by TVXQ! Express