If you could see the close up...the adjustment settings are along the lines of "Too hard" , "Too High", "Too Low".
I have a 3'wide by 4 foot high hand drawn framed copy of that cartoon....done in Thailand by a USAF Flight Engineer who made it as a going away gift for one of his pilots by name of Jerry Crupper. Jerry and his wife were killed by a drunk driver shortly after Jerry retired from the USAF and took a job as an S-76 instructor pilot at American Airlines Training Corporation in West Palm Beach. His daughters gave it to me after Jerry died....at some point I will donate it to either the USAF Museum or the US Army Museum if they will have it. Jerry was a Jolly Green pilot doing combat SAR on Sikorsky H-3 and H-53 aircraft.