Rank 15 documents the Apollo–Soyuz Test Project — the July 1975 joint mission that docked a Soyuz 19 spacecraft with an Apollo Command Module in low Earth orbit, uniting Alexei Leonov and Valery Kubasov with Thomas Stafford, Vance Brand, and Donald Slayton for two days of shared experiments and the famous orbital handshake. Launched separately from Baikonur and Kennedy atop Soyuz-U and Saturn IB rockets, the craft met through an androgynous docking adapter designed jointly by Energia and NASA engineers — hardware that later informed Shuttle–Mir and ISS berthing standards. The mission symbolized détente at the height of superpower rivalry and proved that incompatible space systems could rendezvous safely. International Space renders the dual-craft docked hero, Cyrillic СОЮЗ and UNITED STATES labels, Earth globe, and dense text archive exactly as the master PNG dictates.