I retired from the US ARMY in 2011 after spending 12 years in Military Intelligence as a SIGINT and Electronic Warfare Operator.  While I was on active duty my main focus was to use my knowledge of Radio Frequency Propagation and Cellular Communication to collect battlefield information and target acquisition.  Through necessity I developed an expert level of knowledge about the practical functionality of cell phone networks.  

In my UDEMY courses I use a curriculum to teach cellular network theory that I developed and used (and still use) to teach Military Intelligence Officers, Electronic Warfare Operators, and even Special Forces Green Berets, and Navy Seals.