I have 3 items in mind for this first request...
http://www.turbosquid.com/3d-models/...-desert/406518
http://www.turbosquid.com/3d-models/...ackhawk/406275
http://www.turbosquid.com/3d-models/...longbow/406003
I have found turbosquid to be the best site for having the best 3-d models.
IDK if you have to buy them to be able to make a model or .a2c for them, but if you cant let me know and i'll see if i can get them on SketchUp.