Writing as: John Robb
According to an article at https://monlegionnaire.wordpress.com/page/2/: "John Robb (1917-1993) was a British WWII veteran and later journalist and author who wrote several fiction books in the mid-1950’s that featured the adventure, drama and heroics of the contemporary Foreign Legion. They were not pulp fiction but most certainly could have been marketed as such a couple of decades earlier."