While you all may be infatuated with the offensive aspect of military innovation at the moment, I think that you are also forgetting about military defense. I am not suggesting abolishment of offensive tactics, as I personally also prefer them, however, a country with an effective defense will be able to deflect/avoid attack without causing harm to others. Defense technology allows us to come to peaceful resolution in the absence of violence.
The first issue of defensive technology is stealth. Stealth and safety from direct human observation is easily obtained. Primarily because humans are chiefly dependant upon sight as their dectecting sense. And becoming invisible is not as far-fetched as you may think. Adaptive camouflage
http://www.unusualresearch.com/drreno/adaptivecamouflage.htm is, more and more, becoming a reality. Unfortunate flaws include heat production, energy consumption and cost.
Now, a note on 'passive energy shielding'. Energy is defined as "the ability to cause matter to move". The Passive in 'passive energy shielding' implies that this energy is completely inert: impossible. ENERGY itself is always on a positive scale, as anything on a negative scale is considered endothermic. Passive energy is an oxymoron.
A more practical shielding technique would be, as I would put it, Electro-shielding. The surface to be shielded would be coated in a checkerboard-like fur coating. Every-other hair would be positively charged, while the others negative. If the hairs were firm enough, or the electric field perfectly balenced, a thin sheet of electricity would be projected between the hairs, visually turning the object into a ball of plasma. Any matter which attempted to pass through the field would be ionized (incinerated for vocabulairily-challenged [burnt for the stupid]) nearly-instantly. This would also yield offensive possibilities, as a trooper wearing a suit of this would be a million-degree, walking fireball. And, on a final note, the UV light given off by the spark-gap barrier would probably blind anyone looking at it whilst unprotected. The chief flaws of energy shielding are energy consumption and protection: if the barrier only superheated a particle, then the target would not be protected at all.... Rather than be shot by flying lead, they would be shot with molten ouch....
Most practical shielding methods would also work similarly, if viewed from a practical standpoint. An alternative, involving solid-state protecton would be to suspend a number of magnetic particles in a tight cloud around the user using (duh) magnets. One flaw with this system is that the user would also be blind. Not literally, but, well, human eyes cannot see matter through a cloud of solid iron. Also, a large number of these shields used in close proximity could interact with each other to create a very messy flak bomb. Not good. The magnetic field would also disturb all nearby transistor electronics and any magnetism-based navigational equipment.
Now, back on the topic of Offensive military technology. Some reading, both on the internet and in magazines has revealed to me that the Pentagon wishes to research non-lethal warfare technology, so toss your phasers and lasers out the window. (or at least the government would have us believe that...)
One such non-lethal military device in research right now is the so-called Pain-Beam. Causing less damage to the body than a sunburn, the pain-beam works by essentially cooking the body with microwaves. The frequency of the microwaves is such that it would not cook you like a steak, but would damage nerve tissue to the point of making your body feel as if it is burning.
Another Offensive military tactic that has been long in research is ELF: Extra-low-frequency modulations. More or less, these are radio or sound waves projected in such a manner that they are not detected consciously, but by the acclaimed "subconscious". They are not always used upon the enemy, but on allies as well. While they could be used to cause an enemy to reconsider an attack on 'friendly' soil, they could also be used to entice friendly civilians to join military forces. Unconscious propaganda. Scary.
The final topic which I will discuss is the matter of Human Nerve disruption. Currently, it looks like Trekkie technology. Impossible? Perhaps not. One example akin to nervous disruption that we can observe is in tesla Coils. A could, passed through a magnetic field, is induced with an electric current. Now, what do parts of the body use to communicate, aside from hormones. Everybody, say it with me...ELECTRICITY! So, if we were able to induce current into human nerves as we induce it into circutry, BAM! Insta-seizure. And I mean full-scale seizures! Just like an EMP grenade will destroy any semi-conductors in the blast radius, A nervous signal inductor would cause massive nervous disruption, probably either instantly killing or retarding the victim. Not exactly non-lethal....
Military technology is a very touchy discussion. On one side, you have humanists. "Don't hurt them! They're innocent" You know who I'm talking about. But then again, there are also the more agressive people. You know who you are. "Why are you sending troops into Iraq? NUKE THOSE SOB's!" Military technology would be an even more sensetive discussion if there was no propaganda and brain-washing though....