This is a list of the world's largest armies, measured by the number of soldiers in uniform. This is not a list of the world's strongest armies, since military power is not simply a function of headcount.
Protocol is defined as the rules and customs of a group or a standard procedure. An example of protocol is the method by which a learning center must document their students' progress. YourDictionary definition and usage example.
A reader asked about the meaning and use of the noun protocol. Answer. Protocol has several different meanings, all connected to the idea of guidelines or procedures to follow. It is used mostly in formal or academic language.