One of the things I always liked about the classic Doctor Who was that UNIT was part of the United Nations. Of course in the new incarnation, the real UN got a little bit snooty and serious and said that the BBC could no longer call UNIT the United Nations Intelligence Taskforce, but changed it to UNified Intelligence Taskforce! Back in the 1990s Harlequin Miniatures produced a licensed range of 28mm metal miniatures and I bough back then a fair few blisters. One of these was the UNIT soldier.
I think that this was one of the weaker castings from the range. I think if I do go for a unit of UNIT soldiers that I might go with some other models instead. I am thinking that the Bolt Action British Paratroopers could fit the bill.
They have the berets, they would just be painted light brown as they looked in the 1970s version of Doctor Who.
Of course they could be red if I was going to use them as the modern version of UNIT.