Looking at the memorials of the security personnel killed at the WTC and coming across James Corrigan, I went back and looked at the Naudet footage and found the exact moment they left to go, with Chief Grzelak saying “I’m going to check the command post out”
David Weiss and Brian Sweeney of Rescue 1 asking a WTC employee about any working elevators. Both would die in the North Tower
Chief William McGovern of Battalion 2 giving instructions to Lieutenant Mike Warchola and the rest of Ladder 5. All would be killed that day, including Chief McGovern. Mike Warchola would give a series of mayday calls after the collapse heard by Jay Jonas stating he was “trapped on the 12th floor and hurt bad”, before he succumbed to his injuries
Chief Orio Palmer and his aide Stephen Belson of Ladder 24 head over to the South Tower after the impact. Both will be heard on the Port Authority radio repeaters recordings, and both would be killed that day
Faustino Apostol, Jr., Aide to Chief McGovern that day. Jay Jonas tells how he ran into him on the way down and urged him to leave, but he declined, saying “It’s okay Cap, I’m waiting for the Chief”. He would also die that day
Lieutenant Manuel Del Valle Jr. with his 5 Engine awaiting orders. Lt. De Valle would be the only one from his Engine killed that day, ordering the rest of them out as he stayed behind in the North Tower to assist more people