A front-line Army unit nearly shot down a South Korean military drone during a flight test earlier this week, an opposition lawmaker said Tuesday, just days after the same unit mistook a U.S. spy drone for an enemy threat. The 1st Army Corps, based along the western front bordering North Korea, issued an air defense alert and stood ready to shoot down the drone as it flew through airspace under its jurisdiction Monday, Rep. Sung Il-jong of the main opposition People Power Party said in a press conference at the National Assembly. The drone was with the Army Test and Evaluation Group conducting a flight test. The test group had notified the 1st Corps of its plan to carry out the trial in advance, the lawmaker claimed. The incident followed a similar mishap involving the same unit and the U.S. military, in which the 1st Corps mistook a U.S. drone for a potential threat due to a communication mix-up and mobilized artillery to take it down. The commander of the 1st Corps has been relieved of duty pending a disciplinary evaluation related to the U.S. drone incident and other issues. Calling th