My wife to be is looking at rings for me and before she committed to one or another I wanted to make sure there isn't any metal that the Navy will not let you have in the Aviation Community for things such as safety issues? I know in general titanium can be frowned upon because if the body swells in a crash many times the ring cannot be cut off and the individual could be at risk of losing the finger. Any thoughts on this? Seemed like a legitimate question but just wasn't sure...