I never managed to get one of these when I was actually in the service because I kept forgetting about them. Finally found a decent one at an Antique Shop today.
https://www.milsurps.com/images/impo.../2yJal2N-1.jpg
https://www.milsurps.com/images/impo.../q8NcCyV-1.jpg
https://www.milsurps.com/images/impo.../NWnGwF9-1.jpg
https://www.milsurps.com/images/impo.../a49AQDt-1.jpg