Sir And Ma’am
Being respectful is taught to all soldiers. It doesn’t matter whom they’re speaking to. It could either be the flower lady, the milkman, or your parents, soldiers will call males ‘sir’ and females ‘ma’am’.
Fast Eater
Soldiers have trained themselves to eat meals very quickly because they usually need to get back to their post. It could also be because they are in survival mode as they are in a war zone. Never assume it will be easy for someone who has been in the military to go back to the way they ate pre-army.