It has a few meanings, some say is "Demarcation day", other say it was "Debarcation Day" while others say it was "Decimal Day" or just "Day-Day"; here's a list of all Military designation of days and hours:
A-Day was 20 October 1944, the day the Leyte Island Operation (the invasion of Leyte) began.
C-Day is short for "Candy Day" which usually means when deployment for an operation commences. It is called "Candy Day" because before deployment candy is usually passed out to G.I.s from charitable organizations. (US)
D-Day is the unnamed day on which an operation commences or is due to commence. This may be the commencement of hostilities or any other operation. The most famous is D-Day, June 6, 1944, when "Operation Overlord" began. Contrary to popular belief, the "D" does not stand for any specific word-the most popular being disembark. (NATO)
E-Day is the unnamed day on which a NATO exercise commences. (NATO)
F-Hour is the effective time of announcement by the U.S. Secretary of Defense to the Military Departments of a decision to mobilize Reserve units. (US)
G-Day is the unnamed day on which an order, normally national, is given to deploy a unit. (NATO)
H-Hour is the specific time at which an operation or exercise commences, or is due to commence (this term is used also as a reference for the designation of days/hours before or after the event). (NATO)
I-Day is used informally within the U.S. military bureaucracy to variously designate the "Implementation Day" or the (Delivery Order) "Issuance Day".
J-Day was used during both world wars to designate the day an assault (sometimes amphibious) occurred.
K-Day is the unnamed day on which a convoy system is introduced or is due to be introduced on any particular convoy lane. (NATO)
L-Hour is the specific time at which deployment for an operation commences. (US)
L-Day (for "Landing Day") was 1 April 1945, the day Operation Iceberg (the invasion of Okinawa) began.
M-Day is the day on which mobilization commences or is due to commence. (NATO)
N-Day is the unnamed day an active duty unit is notified for deployment or redeployment. (US)
O-Day is a Maritime Prepositioning Force (MPF, the vanguard of a Marine Air-Ground Task Force, MAGTF) term designating the day the Maritime Propositioning Ship Squadron (MPSRON) off-load begins, or the continuous flow of the Fly-In Echelon (FIE) commences, whichever is later.
P-Day is the expected date at which the rate of production of a consumable equals the rate at which the item is required by the Armed Forces. (US)
Q-Day was 23 June 1945, the day of the dress rehearsal of the first atom bomb test; nowadays it is sometimes used informally to mean "Quality Day", or the first day of the calendar quarter.
R-Day is the unnamed day on which redeployment of major combat, combat support, and combat service support forces begins in an operation. (US)
S-Day is the unnamed day the President authorizes Selective Reserve callup (not more than 200,000 men). (US)
T-Day is the effective day coincident with Presidential declaration of national emergency and authorization of partial mobilization (not more than 1,000,000 personnel exclusive of the 200,000 callup). (US)
V-Day is sometimes used to designate "Victory Day", the day an operation successfully concludes.
V-E Day ("Victory in Europe") designates 8 May 1945, the date when the Allies formally celebrated the defeat of Nazi Germany.
V-J Day ("Victory over Japan") designates 14 August 1945, the date of Japan's acceptance of the unconditional surrender terms.
W-Day is the effective day the President takes the adversary decision to prepare for war (unambiguous strategic warning). (US)
X-Day was 1 November 1945, the day Operation Olympic (the invasion of Japan) was to begin. The term also generically means "attack day".
Y-Day was 1 March 1946, the day Operation Coronet (the invasion of Tokyo Plains) was to occur.
Z-Day was 10 June 1945, the day the Australian Imperial Forces landed in Brunei Bay to liberate Brunei, part of Operation Oboe Six.
A-Day was 20 October 1944, the day the Leyte Island Operation (the invasion of Leyte) began.
C-Day is short for "Candy Day" which usually means when deployment for an operation commences. It is called "Candy Day" because before deployment candy is usually passed out to G.I.s from charitable organizations. (US)
D-Day is the unnamed day on which an operation commences or is due to commence. This may be the commencement of hostilities or any other operation. The most famous is D-Day, June 6, 1944, when "Operation Overlord" began. Contrary to popular belief, the "D" does not stand for any specific word-the most popular being disembark. (NATO)
E-Day is the unnamed day on which a NATO exercise commences. (NATO)
F-Hour is the effective time of announcement by the U.S. Secretary of Defense to the Military Departments of a decision to mobilize Reserve units. (US)
G-Day is the unnamed day on which an order, normally national, is given to deploy a unit. (NATO)
H-Hour is the specific time at which an operation or exercise commences, or is due to commence (this term is used also as a reference for the designation of days/hours before or after the event). (NATO)
I-Day is used informally within the U.S. military bureaucracy to variously designate the "Implementation Day" or the (Delivery Order) "Issuance Day".
J-Day was used during both world wars to designate the day an assault (sometimes amphibious) occurred.
K-Day is the unnamed day on which a convoy system is introduced or is due to be introduced on any particular convoy lane. (NATO)
L-Hour is the specific time at which deployment for an operation commences. (US)
L-Day (for "Landing Day") was 1 April 1945, the day Operation Iceberg (the invasion of Okinawa) began.
M-Day is the day on which mobilization commences or is due to commence. (NATO)
N-Day is the unnamed day an active duty unit is notified for deployment or redeployment. (US)
O-Day is a Maritime Prepositioning Force (MPF, the vanguard of a Marine Air-Ground Task Force, MAGTF) term designating the day the Maritime Propositioning Ship Squadron (MPSRON) off-load begins, or the continuous flow of the Fly-In Echelon (FIE) commences, whichever is later.
P-Day is the expected date at which the rate of production of a consumable equals the rate at which the item is required by the Armed Forces. (US)
Q-Day was 23 June 1945, the day of the dress rehearsal of the first atom bomb test; nowadays it is sometimes used informally to mean "Quality Day", or the first day of the calendar quarter.
R-Day is the unnamed day on which redeployment of major combat, combat support, and combat service support forces begins in an operation. (US)
S-Day is the unnamed day the President authorizes Selective Reserve callup (not more than 200,000 men). (US)
T-Day is the effective day coincident with Presidential declaration of national emergency and authorization of partial mobilization (not more than 1,000,000 personnel exclusive of the 200,000 callup). (US)
V-Day is sometimes used to designate "Victory Day", the day an operation successfully concludes.
V-E Day ("Victory in Europe") designates 8 May 1945, the date when the Allies formally celebrated the defeat of Nazi Germany.
V-J Day ("Victory over Japan") designates 14 August 1945, the date of Japan's acceptance of the unconditional surrender terms.
W-Day is the effective day the President takes the adversary decision to prepare for war (unambiguous strategic warning). (US)
X-Day was 1 November 1945, the day Operation Olympic (the invasion of Japan) was to begin. The term also generically means "attack day".
Y-Day was 1 March 1946, the day Operation Coronet (the invasion of Tokyo Plains) was to occur.
Z-Day was 10 June 1945, the day the Australian Imperial Forces landed in Brunei Bay to liberate Brunei, part of Operation Oboe Six.
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