Defense Minister Ahn Gyu-back on Wednesday presided over a meeting of key commanders and urged the military to strive to defend constitutional values, a year after the failed martial law bid that involved the former defense minister and a slew of military top brass.

The meeting comes a day after Ahn issued an apology over the military's involvement in former President Yoon Suk Yeol's short-lived martial law bid on Dec. 3 last year, when troops were deployed to the National Assembly to block lawmakers from voting down the decree.

"The attitude of general-level officers who took part in the insurrection, who could not discern an unconstitutional order and simply said they followed the orders, made the people view the military coldly. Our military should take this heavily to heart," Ahn said during the meeting attended by some 150 key military officials.

Top generals appointed by Yoon, including former Army Chief of Staff Gen. Park An-su, who served as the martial law commander and former head of the Defense Counterintelligence Command, Lt. Gen. Yeo In-hyung, are currently under trial for playing a key role in the insurrection.

Related