NSA/CSS @NSAGov
#OTD in 1860 MAJ Albert J. Myer began teaching wig-wag, a one-flag comms method, to the Signals Corps. Use by Union & Confederate Armies passing battlefield intelligence led to encryption. The Union's system was never broken. Learn more here: https://t.co/1Possl1VK9 #GoArmy #NCM https://t.co/gwqaYRD5NQ — PolitiTweet.org