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.
The format and procedure that governs the transmitting and receiving of data. The term comes from the Greek protokollon, which was the cover page to a manuscript that provided a description of the contents. See communications protocol, protocol stack and OSI.