Give your FIL a big "Well Done" from an old Grunt.
I'll be sure to give him your greetings and thanks. He's enjoying the stuff we are showing him on the internet, and he's going to love the responses here at the Canteen.
Another one of his "War Stories" he has told us over the years is that he had a friend take the swimming test for him to get into sub service. He never did learn to swim. LOL