Kissin' Cousins (1964)

The U.S. government wants to build a missile silo inside a Tennessee mountain, but the backwoods hillbillies who own it refuse to lease it to them. Josh (Elvis Presley), a relative of the owners and a G.I. scout, is sent in to try to reason with them, but he soon runs afoul of his identical cousin, Jodie (also Presley), who hates his city-bred lookalike and everything he stands for. Meanwhile, troops begin moving into the area, and are seduced by a host of country beauties.