Celebrated on 04/27/2026
National Devil Dog Day honors the U.S. Marine Corps' 5th Marine Regiment, who earned the nickname 'Devil Dogs' during the Battle of Belleau Wood in 1918. The term originated from German soldiers who described the Marines as 'Teufel Hunden' for their fierce fighting. This holiday is observed annually on June 6, coinciding with the anniversary of the Battle of Belleau Wood.
National Devil Dog Day was established to commemorate the heroic actions of the U.S. Marine Corps' 5th Marine Regiment during World War I. The term "Devil Dog" (German: Teufel Hunden) was reportedly used by German soldiers after the Marines' relentless assault at the Battle of Belleau Wood in June 1918. The holiday was officially recognized by the Marine Corps League and other veteran organizations to honor the legacy of the Marines who fought there. The date June 6 was chosen to mark the anniversary of the battle's start.
Over the years, National Devil Dog Day has evolved from a niche observance within Marine Corps circles to a broader celebration of Marine Corps heritage. Today, it is marked by ceremonies at Marine Corps bases, veteran gatherings, and social media campaigns using #NationalDevilDogDay. The 5th Marine Regiment continues to hold commemorative events, including reenactments and memorial services at Belleau Wood in France. The holiday also serves as a reminder of the Marine Corps' ethos of courage and tenacity.
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