Not sure why I was in the left seat
Can't recall what we called them, (probably some kind of "famil"), but the first flight in country was usually the first BGS, (Battle Group South), on the Friday after your arrival in Belize. Unless you had numerous tours under your belt your first trip was always accompanied by a pilot who had been out there for a while or the local crewman leader you were the crewman.
Perhaps you were the pilot accompanying a "new chap".
Another possibility is that by looking at the quality of your pictures I'd guess they weren't taken on the standard "happy snaps special". One could surmise you were a bit of a photo buff and simply went along for a ride and to take some pictures.