Hypersonic flight remains one of aviation's most elusive challenges. Defined by speeds greater than Mach 5, it is a realm where air becomes fire, and the laws of physics wage war against human ambition. Against a rapidly progressing global competitive landscape, the need for repeatable hypersonic flight testing is greater than ever. Meet the Stratolaunch Roc, the largest operational aircraft in the world. From its development history to the engineering firsts along the way, Roc, and the missions it enables, are unlike anything else on Earth.