Just thinking about it, all three space tragedies for the US, are around the same date:
Fire during launch simulation.
January 27, 1967.
Explosion in rocket booster during lauch, due to O-Ring failure because of cold temperatures.
January 28, 1986.
Disintegration of orbital vehicle due to failure in thermal protection on the left wing. The thermal protection system was compromised during launch when a piece of frozen foam insulation broke off the main fuel tank.
February 1st, 2003