He himself joined the Royal Navy in 1910 and trained on the Isle of Wight. His artistic abilities led to him sketching landings in the Dardanelles, where he served aboard the battleship HMSAgamemnon. He retired in 1922 to paint. He returned to his studies at the Royal Academy School and the Royal College of Art. He enjoyed some popularity and staged exhibitions in London, New York and Paris.
In the second world war he returned with the rank of Lieutenant commander and he was a war artist in Alexandria. He was known for illustrating Ronald Arthur Hopwood's poem called The Laws of the Navy (see illustration). The poem dates from 1896[2] when it was written by Hopgood to make fun of organisations. Full of cynicism and humour the poem was recreated on bulkheads and the poem and Langmaid's illustration was applauded by Eeyore Smith.[3]