Jack Garrett: Mae, I want you to meet with the RSO to get a feel for the situation - on the ground there.
Mae Jarvis: Way ahead of you, boss. I already traded emails with the Regional Security Officer, who gave me the lay of the land and said that there have been - no recent abductions.
by Swapo Völker August 05, 2016
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Range Safety Officer

Someone certified by the NRA as a Range Safety possess the knowledge, skills, and attitude essential to organizing, conducting, and supervising safe shooting activities and range operations.
Guy 1: Yo bro who is that guy that just yelled at us?
Guy 2 : That was the RSO, hes a pain.
by kuku02 December 27, 2011
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Real Shit Only. A mindset where in order to achieve one's goals they must focus on the brutal realism of their situation and do what ever is necessary to succeed within their specific situation and achieve their goal.
Masks on. Y'all ready for this? RSO bro lets do it.
by Naastay June 02, 2018
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