When can I start calling someone first name?

I have a case and I have been talking with a police officer. He calls me my first name. I have been calling him Trooper + his last name. But when he sent me an email he signed it off with just his first name. Does it mean I can start calling him his first name? I am from Japan and we never call people their first names unless we are really close.

submitted by /u/almondtree2018
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