Answer:
Lot's of answers below!
Explanation:
Ok, the Declaration was signed officially on August 2, 1776 (not July 4th like you'd think although serveral people did sign it then)
Red October was: November 7-8, 1917 officially but this was actually October 24-25th according to the calendar system in place at the time.
D-Day is the commonly used name for the Normandy invasion, the "D" stands for Day, as simiply put. It can also be referring to depart, or Depart-Day but according to standard military terms, the D is Day such as H is Hour.