The President who officially transformed Armistice Day into Veterans Day was Dwight D. Eisenhower. He signed legislation in 1954 replacing “Armistice” with “Veterans,” and the holiday has been known as Veterans Day since then. Answer in brief:

• Armistice Day origins: Woodrow Wilson first proclaimed Armistice Day on November 11, 1919.

• 1954 change: Congress amended the act, and Eisenhower signed the bill on May 26, 1954, substituting “Veterans” for “Armistice” to honor all veterans.

If you’d like, I can pull exact proclamations or provide a short timeline with primary-source links.