Each year on National Wreaths Across America Day, trucking firms deliver trailers filled with thousands of wreaths to cemeteries across all 50 states, to remember and honor U.S. war veterans.

These trucking companies are part of what the non-profit organization Wreaths Across America calls the "Honor Fleet."

This year's event took place on Dec. 17 at 3,136 locations, including Arlington National Cemetery. A total of 390 carriers delivered 525 truckloads of wreaths, according to a news release from Wreaths Across America.

Check out the social media posts and photos below from 2021's event at sites across the nation.

The #WreathsAcrossAmerica convoy, led by our Workforce Heroes truck, arrived this morning @ArlingtonNatl, where generations of American heroes have found their final resting place. @WreathsAcross' mission is to serve, honor & teach about service, sacrifice and America's fallen. pic.twitter.com/Et5q3itf6J

— American Trucking (@TRUCKINGdotORG) December 18, 2021

We are continuously grateful for our partnership with Wreaths Across America. ????

This year, one of our road team drivers, Scott B. was able to deliver wreaths to San Diego to help commemorate our veterans.

Thank you Scott and to all those who have served. ⭐#CREngland pic.twitter.com/YgwrP2FRML

— C.R. England (@CREngland) December 20, 2021

THANK YOU Findlay & Hancock County for showing up this morning for Wreaths Across America! It was cold & rainy but to see the dedication of the people in our community was something else. Let us continue to Remember, Honor & Teach for generations to come. ❤ #WreathsAcrossAmerica pic.twitter.com/Nww1aBWxeE

— Garner Trucking, INC (@GarnerTrucking) December 18, 2021

The AMU-wrapped Wreaths Across America truck & @MSRTransport driving team, Robyn, Doug, & Opie ????, arrived in Maine early this morning to pick up a load of wreaths & are now headed to drop-off destination in Marietta, GA — stayed tuned for more! #WAA2021 #APUSwreaths pic.twitter.com/wNOcgLNlep

— American Military U (@AmericanMilU) December 16, 2021

The Wreaths Across America trip continues as driver Shawn Furrell stops in New Freedom PA to drop a large number of wreaths pic.twitter.com/h7tKnILPzL

— SPD Trucking (@SmokeyPointDist) December 17, 2021

We were honored to participate in @WreathsAcross Day this past weekend. 2500 wreath-laying ceremonies were carried out to remember our fallen veterans. ????????
Thank you to Driver and Marine Corps Reservist Justin U. for making this delivery. pic.twitter.com/a44uvSwdvP

— Swift Transportation (@SwiftTransport) December 20, 2021

We were honored to participate in this year's National Wreaths Across America Day over the weekend. This year, our team delivered 2 loads of wreaths, one of which was delivered to the Chattanooga National Cemetery. Special thanks to our drivers and all who volunteered. pic.twitter.com/Ns7GqzRTWq

— U.S. Xpress (@usxpress) December 20, 2021

National Wreaths Across America Day (Dec. 18) is less than 2 days away and Clifton Anderson, an Army veteran with over 1.3 million safe driving miles and one of our #WreathsAcrossAmerica drivers, is loaded and ready to “Move the Mission” to Florida. pic.twitter.com/ZKeJFazeOR

— USA Truck Inc. (@USATruck_Inc) December 16, 2021

Thanks to Werner team drivers, April and Timothy C. (third and fourth from the right), for transporting a load of wreaths for "Wreaths Across America." Those wreaths will be placed at the graves of our fallen heroes. pic.twitter.com/X17rHLW4hB

— Werner Enterprises (@One_Werner) December 17, 2021