The failed coup attempt took 249 civilian lives. US-based Turkish national Fethullah Gulen is being accused of orchestrating it. The leader of the FETO network lives in self-imposed exile in Pennsylvania.
Sergeant Halisdemir was deployed to the Special Forces Command where he was shot dead defending the base on the night of July 15, 2016.
During his two-day visit to Ankara, NATO Secretary-General Jens Stoltenberg will meet with Turkish President Recep Tayyip Erdogan, Prime Minister Binali Yildirim, Foreign Minister Mevlut Cavusoglu and Defence Minister Fikri Isik.
In his testimony, Chief of Staff General Hulusi Akar blasted the coup attempt against the elected government as a "dark stain on Turkey's history".
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