John O'Neill may refer to: Wikipedia
Lieutenant John O'Neill VC MM (also spelt O'Niell) (10 February 1897 − 16 October 1942) was a British Army officer and a Scottish recipient of the Victoria Cross (VC), the highest and most prestigious award for gallantry in the face of the enemy that can be awarded to British and Commonwealth forces. Wikipedia
John Ellis O'Neill (born February 19, 1946) is a Vietnam War veteran, lawyer, and the spokesman for Swift Vets and POWs for Truth (SBVT). Wikipedia