https://dropfile.to/yAuKa
one of those models is less of a model and more of a masssive stack of meshes of weapons, which i chose not to pick apart, dae is fairly simple to separate meshes, FBX too since the format i chose was the 2015 ascii format, Autodesk provides a free utility to inter-convert any fbx format to another fbx format.
i will however lecture at this point that there is no such thing as fair use with regards using copyright materials, generally game model converters fringe copyright laws because they are mostly used to mod the games they are made for rather than outright theft of models from game x for use in game y.
Consider this message and the permissions of those models before you use them as part of even a free game
if you have an ounce of conscience, then i will consider your reading my lecture and warning payment in full :p
also gl with your project
Edit: PM sent, link lasts 23hours from time of this post