A trial opened Wednesday for four Indonesian service members accused of carrying out an acid attack on a prominent human rights activist, in a case that has reignited concerns about military impunity. Three Indonesian navy marines and one air force officer, all assigned to military intelligence, are charged with serious premeditated assault in the March attack on Andrie Yunus, a human rights lawyer and senior activist with the Commission for the Disappeared and Victims of Violence, known as KontraS. Those on trial in a military court in Jakarta are Sgt. Edi Sudarko; First Lt. Budhi Hariyanto Widhi Cahyono; Capt. Nandala Dwi Prasetya; and Air Force First Lt. Sami Lakka. The charges carry a sentence of up to 12 years in prison if convicted. Prosecutors allege the four men acted together but described the motive as personal.…