Eleven nines covers ordinary infrastructure failures, not acts of war that physically destroy the underlying facilities.
It's similar to any engineered artifact, like a skyscraper. They have a structural safety factor that defines their resilience to failures that the system is designed to tolerate, it doesn't make them immune to missile strikes.
This is a normal failure mode in American military facilities in the Middle East. Whoever designed an American military facility in the middle east and did not intend for it to withstand missile attacks was incompetent.
It's similar to any engineered artifact, like a skyscraper. They have a structural safety factor that defines their resilience to failures that the system is designed to tolerate, it doesn't make them immune to missile strikes.