 He led a team of roughly 40 special forces operatives in an attempt to secure Special forces Headquarters and organize attacks against government agencies and the parliament.The attempt ended in failure, when senior master sergeant Ömer Halisdemir, a noncommissioned officer (NCO) with the Turkish military's Special Forces Command (OKK), shot and killed Semih Terzi, demoralizing and disrupting command and control of the rebels.The Special Forces are not aligned to any of the three branches of the TAF, receiving its orders directly from the General Staff of the Republic of Turkey.