When radio communication came to replace the old technology, the letter "R" was still used to represent the "yes."
However, military faced difficulty to pronouce the letter "R" especially in critical situation.
Therefore, they looked for the word to represent the alphabet "R" and here it came Roger.
Today, Roger become a common word in military radio communication to represent the word "yes."
The author plays with the word "berg"
Military = Armed force
Moss code = The first telecommunication use set of dash (long signal) and dot (short signal) to represent characters.
Represent = Indicate by symbols
Critical = Under very serious condition
Alphabet = The letter of a language
Some sources from http://www.thefreedictionary.com
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