Military Branch Birthdays and Observances: The Complete Calendar
Six branch birthdays, a year of observances, and the planning order units actually use. Bookmark the dates and work backward from each one.
The six U.S. military branch birthdays are: Army, June 14, 1775; Navy, October 13, 1775; Marine Corps, November 10, 1775; Coast Guard, August 4, 1790; Air Force, September 18, 1947; and Space Force, December 20, 2019. Each service marks its date with ceremonies, cake cuttings, and birthday balls.
Beyond the birthdays, the military calendar carries a steady set of national observances that units mark with ceremonies, runs, and displays. Use the tables below to load the year, then work backward from each date with the planning order at the end.
When Is Each Military Branch Birthday?
Three of the six services date to 1775 and the Revolutionary War, while the youngest turns seven this December. The table gives the date each branch celebrates and the founding year behind it.
| Branch | Birthday | Founded |
|---|---|---|
| Army | June 14 | 1775 |
| Navy | October 13 | 1775 |
| Marine Corps | November 10 | 1775 |
| Coast Guard | August 4 | 1790 |
| Air Force | September 18 | 1947 |
| Space Force | December 20 | 2019 |
Which Observances Belong on the Unit Calendar?
National observances fill the space between birthdays, and most installations mark several of them with formations, ceremonies, or community events. These are the dates unit calendars build around.
| Observance | When |
|---|---|
| Memorial Day | Last Monday in May |
| Armed Forces Day | Third Saturday in May |
| Flag Day | June 14 |
| Independence Day | July 4 |
| Purple Heart Day | August 7 |
| POW/MIA Recognition Day | Third Friday in September |
| Veterans Day | November 11 |
| Pearl Harbor Remembrance Day | December 7 |
How Do Units Mark a Branch Birthday?
The traditions vary by service, but the shape of the day repeats: a formal moment, a shared cake, and something to take home. The Marine Corps ball is the model most other events borrow from.
- The cake cutting. The oldest and youngest members present are honored at the cake, passing tradition between generations. At a Marine Corps ball the first piece goes to the guest of honor and the second to the oldest Marine present, who passes a piece to the youngest.
- The birthday ball. A formal dinner with a ceremony and a reading of the service’s birthday message.
- Runs and formations. Esprit runs, morning colors, and installation-wide events on or near the date.
- Commemorative coins. Many units strike a dated coin for the year’s birthday and present it at the event.
How Far Out Should You Plan Each Event?
Birthday events are predictable to the day, which makes them the easiest events of the year to plan early. The order below keeps custom work off the critical path.
- First: custom pieces. Coins and engraved gifts with new artwork need the longest runway.
- Next: venue and counts. Lock the room and the headcount before finalizing favors.
- Then: engraving names. Award winners and honorees confirmed and spelled correctly.
What Keepsakes Fit a Birthday Observance?
Birthday keepsakes work because the date does the storytelling. Anything that carries the year becomes part of a series people collect across a career.
- A dated birthday coin. The strongest single keepsake; collectors look for the year first.
- Cake-cutting gifts. Engraved pieces for the oldest and youngest members honored at the cake cutting.
- A trophy-case plaque. Anniversary plaques belong where visitors and new arrivals see them.
Frequently Asked Questions
The Army on June 14, the Navy on October 13, and the Marine Corps on November 10, all during the Revolutionary War. That is why all three birthdays carry the deepest tradition.
November 10, 1775 is the date the Continental Congress authorized raising two battalions of Continental Marines. Marines have marked it with a formal ball and cake cutting for about a century.
Yes. The Space Force was established on December 20, 2019, and marks that date as its official birthday alongside the other services.
The oldest and youngest members present are honored together at the cake, symbolizing tradition passing from one generation of service to the next. At a Marine Corps ball the first piece goes to the guest of honor and the second to the oldest Marine present, who passes a piece to the youngest. Most branch birthday events include a cake cutting.
The third Saturday in May. Unlike the branch birthdays, it honors everyone currently serving across all services at once.
Typically through unit funds, ticket sales, and fundraisers run earlier in the year. Committees that presell tickets or merch avoid fronting costs.
Marking a Birthday This Year?
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