On April 12, 1961, Yuri Gagarin became the first person to fly into space! 🚀 (lemmygrad.ml)
Report from a US Colonel in 1971 - collapse of discipline in the US military only exceeded by the Tsarist army in 1917. By the end of the war in Vietnam, 30% of officer casualties were fratricide. (web.archive.org)
A great visualization of WW2 showing major events and where the bulk of the fighting happened
https://media.mas.to/masto-public/media_attachments/files/111/914/791/279/577/607/original/6ed542152776e174.mp4