First was Osprey New Vanguard #197: M103 Heavy Tank 1950 – 74; these tanks were the ones that I used to see to emulate WWII vehicles in a lot of movies made during that period. It seemed like after that the movie-makers would actually seek out period appropriate vehicles to use. Anyway, I found this a bit boring. Pity.
Then, Osprey Elite #186: Vietnam Infantry Tactics. I've been enjoying the various books that detail tactics; this is one more of the same. I found this one to be a pretty solid read.