The U.S. Marine Corps was formed 242 years ago today.
The birthday is the social event of the year for Marines. In big garrison towns, there will be formal balls. In places like Europe, where only a few Marine Officers may be stationed in a particular place, they will hold the ball and it will be a big time for everyone. Expensive, since the cost is large and it's prorated amongst the officers. Where there are Marines, there will be a celebration of some sort, commensurate with the situation.