The Department of Defense, (DOD)will be beaming a white memorial light skyward in a vertical manner at the Pentagon on 2 successive full evenings from dark to dawn on September 10 and September 11th only during the hours of darkness.
Over the weekend DOD will be installing and testing the light beam so you may also see it then.
A memorial light? Beaming white light skyward for two nights in a row? I'm all for honoring those who perished in the attack on the Pentagon, but I don't know if keeping residents of nearby Pentagon City awake at night is the right way to do it. Who plans out this sort of thing anyway?