I doubt it. Frank Jaeger(Fox) was a young soldier in the 80s with Big Boss. Plus all the trailers hinting the games gonna taking place in the 60s.
Its funny how Johnny keep coming back.
He's from a long line of cell guards. In MGS1 takes a crap while on guard and in MGS2 takes a crap while guarding the hostages. I wonder what will he do in MGS3? perhaps more crap