1958, acronym for surface to air missile.
masc. proper name, typically a shortening of Samuel (q.v.).
Sam Browne in reference to a type of belt with shoulder strap is by 1915, from Sir Samuel James Browne (1824-1901), the British general who invented it. Sam Hill as an American English emphatic euphemism for "Hell!" (in exasperation) is by 1839. Sam Slick as the type of the resourceful Yankee (especially in the mind of the South) is from the character created 1835 by Nova Scotian judge Thomas Chandler Haliburton in a series of popular books.
I’ll tell you how I’d work it. I’d say, “Here’s a book they’ve namesaked arter me, Sam Slick the Clockmaker, but it tante mine, and I can’t altogether jist say rightly whose it is …. Its about the wittiest book I ever seed. Its nearly all sold off, but jist a few copies I’ve kept for my old customers. The price is just 5s. 6d. but I’ll let you have it for 5s. because you’ll not get another chance to have one.” Always ax a sixpence more than the price, and then bate it, and when Blue Nose hears that, he thinks he’s got a bargain, and bites directly. I never see one on ’em yet that didn’t fall right into the trap. [from "The Clockmaker: The Sayings and Doings of Samuel Slick of Slickville"]