However, you might hear some informal terms used in specific contexts, but they are not as common or universally understood as slang terms for other ranks:
* "Butter bar": This term is more common for a new officer in general, often referring to the gold bars worn on the uniform, rather than a specific rank.
* "Second looey": This is a shortened, informal version of "second lieutenant" and might be used jokingly or casually.
* "Junior officer": This term is not specific to a particular rank but encompasses all officers with less experience.
It's important to remember that using slang terms for military ranks can be seen as disrespectful in certain situations. It's always best to use the official rank when addressing someone formally or in a professional setting.