It is The best dam military on Earth. Kicking covenant ass since Halo CE for Xbox.
Joe: "If your gunna go, then im right behind you man"
The UNSC has fought several major battles in its history, starting with the Jovian Moons campaign, the Rainforest Wars, all the way to humanity's near extinction with the UNSC/Covenant War in which they emerged victoriously.
Master Chief- Relax, you numskull. What you saw was what is going to happen to you when you finally find out that you have half a dozen needlers sticking in your side. Oh, and they were launched by a grunt too.