U.S. Defense Secretary Leon Panetta handles the ceremonial scissors from U.S Marine Corps Lance Cpl. Kyle Carpenter to cut the ribbon at the dedication ceremony at the Walter Reed National Military Medical Center. (Jonathan Ernst/Reuters)

Since then, we’ve formed a common perception that those serving in the United States Marine Corps are unfailingly, unflinchingly tough. They’ve been called Leathernecks, Devil Dogs, Jarheads and the President’s Own. Their motto, “Semper Fidelis,” is Latin for “Always Faithful,” and for their 236th birthday today, many of them went for a run to build camaraderie before any cake was served.

#SemperFi was a topic of Twitter conversation in the D.C. this morning. Here’s what locals had to say:

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