roger is a little bit diff to yes, roger mean that you hear it loud and clear, understood everything has just passed on and will either pass it on or do it. yes mean u understood but doesnt tell the person other end of the radio more more then that...<br />
at least that whats my understanding of it anyway.
"roger" implies understanding as far as pilots, military, and other professions are concerned. a simple yes could leave doubt when it is important to be instantly clear. that is why