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Continuity mistake: When the G.R.S. team is on their day off (9/11 anniversary), Tanto is seen video chatting with his wife. In the frontal shot of him, he's using a Samsung smartphone, but in the next shot, it changes to a Blackberry. This is done multiple times throughout the scene.
Answer: Ansar-Al-Sharia isn't ISIS; it was disbanded in 2017. The group the soldiers were fighting weren't ISIS, they were February 17th Martyr's Brigade. The soldiers at the end were Tripoli GRS reinforcements.