What does M-Day stand for?

M-Day stands for "Day on which mobilization begins"

How to abbreviate "Day on which mobilization begins"?

"Day on which mobilization begins" can be abbreviated as M-Day

What is the meaning of M-Day abbreviation?

The meaning of M-Day abbreviation is "Day on which mobilization begins"

What does M-Day mean?

M-Day as abbreviation means "Day on which mobilization begins"