Third Army commander Somsak Nilbancherdkul said the UH-72 helicopter went missing at about 10:30 (local time) on August 14 with five officers on board, including Commander of the Fourth Infantry Division Nopporn Ruanchan.According to Somsak, the missing chopper was returning to a base in Phitsaanuloke from a relief operation mission in Pai district, near the border with Myanmar.Spokesperson of the Thai government, Colonel Winthai Suvaree confirmed that the helicopter was missing.