Pentagon

Many transgender individuals are already serving. This would allow them to do so without fear.
The attack reportedly impacted 4,000 personnel.
"He was the leader of a network of veteran al-Qaeda operatives, sometimes called the Khorasan group."
In several of the books that have since been written about 9/11, it's noted that the Walt Disney Company quickly closed its stateside theme parks that day. Reportedly out of concern that the Disneyland and Walt Disney World Resorts might also be on the terrorists' target list.