The WOD itself is completely symbolic.
The 1k row + 1001 m run represents the year the attack took place.
The 11 reps of 9 exercises represents the date.
125# thrusters represent the # of deaths @ the Pentagon.
The 175# PC symbolizes AA Flight 175 that hit the tower.
The 170# Deadlift is symbolic of Flight 77 and 93 combined.
The 110# push jerk represents the number of floors in each tower of the World Trade Center.