By Prasit Leelahakhunakorn
The explosion, which occurred five seconds after Kanokpol (whose last name was withheld) pulled out the grenade's pin, instantly killed Somchai who snatched the explosive.
The blast tore off the trainee's lower arm. Somchai is survived by his wife and their 11-year-old daughter.
Somchai's funeral was held at his hometown Chumphon's Tha Sae district.
Sergeant Major First Class Somchai Thanabat
"He was nice and friendly so he was loved by friends and villagers. He often came to visit relatives and he was helpful to others and never boasted about being a soldier. His dream was to become a commissioned officer, but he passed away first. He died a hero, a responsible instructor who saved his trainee during dangerous training," said childhood friend, a Bangkok-based engineer Naran Daengsakol, 33.
After his parents died, Somchai was raised by his foster mother Taem Buchatien, 78, who had a rubber plantation in Tha Sae. He studied at Ban Khanthasap School and completed an advanced vocational certificate at Thasae Industrial and Community College before being drafted to serve at Thanarat Camp.
He later became an army instructor.
Defence Ministry spokesman Lt-Gen Kongcheep Tantravanich said Defence Minister General Prawit Wongsuwan offered his condolences to the families of Somchai and the injured trainee.
The army would provide them with aid, including for Somchai's funeral and Kanokpol's medical expenses, Kongcheep said. A probe into the incident would step up safety measures, he added.
Army spokesman Colonel Winthai Suvaree said commander-in-chief Apirat Kongsompong offered his condolences and financial assistance to the two families.