User blog:Echo 1/UNSC Weaponry seems unrealistic

I was thinking on Halo UNSC weapons a while ago and was thinking on why there are no Direct Energy Weapons (DEWs) for the UNSC (besides the Rhino tank, Sparrowhawk, and Spartan Laser). Many military forces today are researching and developing large, vehicle-mounted DEWs, and some are trying to make handheld versions. Death rays were being tested in WWII. In 552 years, I'd think Humanity would have more vehicle mounted DEWs and even some handheld versions. I'm planning on making a Sci fi book where we still have kinetic weapons, but long-range weapons are usually DEWs.

So why doesn't the UNSC have particle beams or plasma weaponry in 2552. It just doesn't make sense on how, with DEW research and development today, that an international interplanetary military organization wouldn't at least mount thier starships with DEWs. I'd like to know why there are'nt any "laser beams" in the games. Only three DEW weapons exist in Halo: SPARTAN Laser, Rhino Tank, and Sparrowhawk.