The Aztec Club of 1847, founded by Mexican War veterans, presented this medal to the Tomb of the Unknown Soldier; the club is still open to descendants. This medal is a reminder that the Tomb honors all missing and unidentified service members from all periods of US history.

🔥🌻 This March, the #IAFF springs forward – 364,143 members united to advance what every #firefighter and emergency medical worker deserves: ✔️ Stronger health protections ✔️ Safer working conditions ✔️ Fair pay ✔️ Better benefits Here's to a season of growth!

When the Hoover Dam was completed on this day in 1936, a dam project of its monumental scale had never been built in America. The 726-foot high-arch gravity dam remains among the most celebrated pieces of our nation’s infrastructure. Still, nearly a century later, more dams in the United States are being removed than built. What happened? In honor of the 90th anniversary of the country’s preeminent dam, find out what’s happening to the rest of them—read the 1st in a multipart #ASCSource series examining the status of U.S. dams: go.asce.org/3OBNitl.