reply to post by masonicon
You question can't be answered in its current form. Tactical and / or strategic impact of new types of weapons will depend on the exact nature of the
weapon.
If the 'ray gun' in question is some form of laser, then you'll see more and more defensive use of obscuring devices and aerosol agents to disperse
the beams. Other than that, things wouldn't change a great deal
If the 'ray gun' were some sort of particle accelerator weapon, it would probably force the development of some form of magnetic shielding. There
would probably be a slight drop in the range at which battles take place, since both lasers and particle streams travel line-of-sght, and both degrade
over distance due to interaction with the atmosphere.
If you're going to posit the use of some undefined, 'Star Trek / Star Wars' energy weapon with no known properties other than special effects,
it's going to be hard to speculate on how it would change the battlefield.
As for electromagnetic projectile weapons, you'd see guns get smaller (at least in bore size), and open up the possibility of some truly outrageous
indirect fire ranges. Whether those ranges could be used would depend on your ability to spot targets and register fire...it would come down to the
skill of your forward observer, rather than the technology of your gun. Face it...the E-M projectile weapons are just projectile weapons, albeit with
very high muzzle velocity. All you're really going to change is the outer limiit of extreme range.
Perhaps the biggest change that either type of weapon would bring is in the mass of the vehicle carrying it...directed-energy weapons and E-M
projectile weapons are real power-hogs, and carrying the generators and fuel for same means a very heavy rig.
In short, with any technology we can currently understand (note that I didn't limit that statement to what we can build), a switch to directed energy
or EM weapons will have surprisingly little impact, and carry a substantial penalty in weight, power requirement, and (by implication) cost...that's
why the chemical powered projectile thrower and the rocket are still the mainstays of weapon design, even though they represent technologies that, at
their heart, are centuries old.