[1] At the age of 18, Wallace entered the Royal Military Academy Sandhurst where he passed out top of the order of merit, receiving the Queen's Medal.

[3] The regiment saw service in Penang and Borneo during the Indonesia–Malaysia confrontation as part of Far East Land Forces (FARELF) from December 1964 to November 1967 under Lieutenant Colonel Edwin Bramall.

[2] While on exercises at Celle, British Army of the Rhine, he was sharing a tented trailer with his second-in-command when a gas lamp exploded and set the accommodation ablaze.

One of his senior colonels, who had served under him in Germany and at the Permanent Joint Headquarters, described him as "A no-nonsense, to the point, agile-thinking and inspiring leader".

The widely acclaimed exhibition With the Rifles to Waterloo will remain as a lasting legacy of his skills as a fund-raiser and project manager.

[2] He had been an accomplished cricketer from his youth and became a single-figure handicap golfer, having a fine record playing in the army golf team on many occasions.

He had three books published and regularly presented papers on a range of military subjects; these included a talk on one of his ancestors, Lieutenant-General Sir George Augustus Quentin, who had fought in the Napoleonic Wars.