Its hard to say what the earliest iterations of the OWLF were, but it could simply be a case of competing organizations. If you're at all interested, there's a awesome book written by a remarkably credible source, United States Army Colonel Philip J. Corso, titled "The Day After Roswell". It's a pretty compelling read that delves into just how uncoordinated and at odds government branches and intelligence organizations in the United States can be with each other. A reality which has only become more evident in the last few years. So it's possible some form of the organization was there and maybe we just haven't seen it depicted. There's a character in Race War fitting Keyes' description as well, since all the Keyes clones seem to get killed maybe it's a situation like Patton Oswalt and his brothers from Agents of Shield.
I'm really stoked to read the new Hunting Grounds prequel novel because it sounds like it's really going to delve into some details about the lore that's already been introduced in the game's recordings. What I found most interesting in the sample chapter that's up online is the author's wording describing scattered reports of Dutch "or at least someone matching his description and military prowess". Sly reference to Det John Schaefer perhaps? Either way I'm thrilled.