Complex sentence: ERDL pattern is a camouflage pattern developed by the United States Army at its Engineer Research & Development Laboratories (ERDL), back in 1948, but first issued to elite reconnaissance and special operations units in early 1967, during the Vietnam War.
Split into simpler sentences: ERDL pattern is a camouflage pattern developed by the United States Army at its Engineer Research & Development Laboratories (ERDL) in 1948. It was not issued to elite reconnaissance and special operations units until early 1967, during the Vietnam War.