'Roger that' meaning
'roger that'. What does that expression exactly mean?

Question

Answer

roger     /rɒdʒ.ə r /   /rɑ.dʒɚ/  exclamation

used in radio communications to mean that a message has been received and understood 
    "You are clear to land." "Roger, I'm coming in to land now."

Answer

While in the current spelling alphabet (NATO), R is now Romeo, Roger has remained the response meaning "received" in radio voice procedure. In the US military, it is common to reply to another's assertion with "Roger that", meaning: "I agree".

https://www.theguardian.com/notesandqueries/query/0,,-189587,00.html

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