This is a quote attributed to Cyril Richard Rescorla. Rescorla was British and originally trained as a Paratrooper in BA. He later found himself as a Platoon leader in AirMobile Infantry [0] distinguishing himself in la Drang Valley 1965 in the first American encounter with NVA.
Hard-core as they come.
A measure of a persons character is how they conduct themselves under extreme pressure. Rescorla would sing Welsh tunes to calm his troops in that desperate battle reported by reporter Joe Gallaway. A book was co-written with the Commander, Hall Moore and later turned into a film, "Once we were Soldiers"
It was reported Rescorla, a Security Officer for Morgan Stanley also present in the '93 bombings (great side story, Rescorla infiltrated and identified a radical Iman at a NY Mosque who was later charged) made his views clear that MS should have moved out of the WTC.
Rescorla was in his office on the 44th floor
at 8:48 a.m., when the first plane struck the
neighboring tower. At 9:10 a.m., a plane hit
the second building where Morgan Stanley,
an international financial services firm,
had offices between the 43rd and 66th floors.
Survivors said Rescorla grabbed a bullhorn
and cleared out 3,800 workers from 20 floors. [0]
"Rick could be heard saying "... be proud to be an
American ... everyone will be talking about you
tomorrow," and singing God Bless America and other
patriotic and military songs over his bullhorn
to help evacuees stay calm as they left the tower." [2]
[0] http://www.weweresoldiers.net/rick.htm
[1] https://en.wikipedia.org/wiki/Rick_Rescorla
[2],[3] http://history.army.mil/news/2015/151100a_Rescorla.html