how did the big red one get its name
1st Infantry Division (United States) The 1st Infantry Division is a combined arms division of the United States Army, and is the oldest continuously serving in the Regular Army.[4] It has seen continuous service since its organization in 1917 during World War I.[5] It was officially nicknamed "The Big Red One" (abbreviated "BRO"[2]) after its shoulder patch[5] and is also nicknamed "The Fighting First".[5] However, the division has also received troop monikers of "The Big Dead One" and "The Bloody First" as puns on the respective officially sanctioned nicknames.[6] It is currently based at Fort Riley, Kansas.
Red giant When the star exhausts the hydrogen fuel in its core, nuclear reactions can no longer continue and so the core begins to contract due to its own gravity. This brings additional hydrogen into a zone where the temperature and pressure are adequate to cause fusion to resume in a shell around the core. The outer layers of the star then expand greatly, thus beginning the red-giant phase of the star's life. As the star expands, the energy produced in the burning shell of the star is spread over a much larger surface area, resulting in a lower surface temperature and a shift in the star's visible light output towards the red – hence it becomes a red giant. At this time, the star is said to be ascending the red-giant branch of the Hertzsprung–Russell (H–R) diagram.[6]