RETA CIRO Training at California – Ammonia Operator 2. We wish this group the best in their future endeavors of ammonia refrigeration. Discover your calling in life and the intelligence your brain is wired for. Lose yourself in your work with peak experiences and time of uninterrupted ecstasy. When this happens, it will reassure you have found your calling. To get a quote for us to come onsite and provide a private training course see this link. To see our current schedule see this link.