The oldest surviving British war veteran presented naval helicopter pilots with their wings on Thursday.
Mr Allingham is 110
Henry Allingham, 110, from East Sussex, presented the honours at RNAS Yeovilton in Somerset.
Mr Allingham trained as a mechanic and joined the Royal Naval Air Service in September 1915. He was also part of the RAF's creation in 1918.
During his career he joined HMT Kingfisher and was involved in the Battle of Jutland in 1916.
Mr Allingham was also due to attend the Fleet Air Arm Museum, where he would see a Short 184 seaplane which took part in the battle.
The Museum's director, Graham Mottram, said: "We are honoured that Mr Allingham will visit the museum.
"I can't wait to see his face when he is reunited with an aircraft of his day."
RNAS Yeovilton is home to Royal Navy Lynx Helicopters and Royal Navy Commando Helicopter Force.