The U.S. evacuated the camp three days later. Military commanders had already decided to close the base the previous summer, but delayed doing so because of other operations. It was this delay that proved fatal to some of the troops stationed at COP Keating.
The report found that a "mindset of imminent closure" led the unit to not improve the outpost's defenses despite intelligence reports that warned of a possible attack by "a large enemy force."
The report concluded that it was the lack of adequate defenses that made Keating "an attractive target" for the Taliban. Located along a riverbank in Kamdesh, Afghanistan, the base was surrounded by steep mountains. The report said that there were as many as 47 attacks in the five months prior to the deadly assault, 10 in the 30 days prior to the mass attack.
In the wake of the attack, several soldiers based at COP Keating told ABC News that they did not know the attack was as large as it was because they received enemy fire with such frequency.
ABC News' Karen Russo contributed to this report