Autonomous Rotocraft Sniper System (ARSS): Mentioned above.
Rocket balls: A hollow sphere with rubberized rocket fuel. The fuel ejects when lit, bouncing off walls and knocking down doors. What does the most damage is the fact that the rocket ball heats up the inside of the room or bunker to above 1000 degrees Fahrenheit, destroying everybody inside.
Thermobaric bomb - 200: The thermobaric bomb crushes caves with a super-hot blast that can destroy internal organs as far as a quarter-mile away. Its explosion is designed to tunnel through convoluted caves and pulverize anyone hiding as deep as 1,100 feet inside, and then incinerate whatever remains.
Boomerang (mobile shooter detection system): The Boomerang unit attaches on a mast to the rear of a vehicle and uses an array of seven small microphone sensors. The sensors detect and measure both the muzzle blast and the supersonic shock wave from a supersonic bullet traveling through the air (and so is ineffective against sub-sonic ammunition). Each microphone detects the sound at slightly different times. Boomerang then uses sophisticated algorithms to compute the direction a bullet is coming from, distance above the ground and range to the shooter in less than one second. Users receive simultaneous visual and auditory information on the point of fire from an LED 12-hour clock image display panel and speaker mounted inside the vehicle. For example, if someone is firing from the rear, the system announces "Shot, 6 o'clock", an LED illuminates at the 6 o'clock position, and the computer tells the user the shooter's range, elevation, and azimuth.
Boomerang works in extreme weather, in open field and in urban environments, whether static or moving. BBN states that false shot detections are less than one per thousand hours of system operation at vehicle speeds under 50 miles per hour. Only on one vehicle per platoon.
Iron Curtain: This vehicle-mounted device uses radar, optical sensors and some other secret elements to detect projectiles. It then destroys them right before impact, creating an explosion but one that is much less harmful to the vehicle. Available on 25% of Swiss Army's vehicles.
Dense Inert Metal Explosive (DIME): Precision guided missile with a carbon-fiber shell that is filled with tungsten powder that travels only a short distance, killing all inside a room but leaving the building itself intact.
Railguns: Entirely electrical gun that accelerates a conductive projectile along a pair of metal rails using the same principles as the homopolar motor. Railguns use two sliding or rolling contacts that permit a large electric current to pass through the projectile. This current interacts with the strong magnetic fields generated by the rails and this accelerates the projectile. The Navy equips its battleships with 64 megajoule railguns.
Advanced Tactical Laser - 21: 12,000 pound laser mounted on the Airbus A400M transport aircraft. Can attack from 10,000 feet and five miles away. Can hit up to 100 targets in succession.
Rocket Red Brigade - 3,000: Elite soldiers from Russia in battle armor that grants them strength, invulnerability (against bullets, yes; RPGs and missiles, not so much), flight (through rocket packs/boots), the ability to project powerful energy blasts and "mecha-empathy" — the ability to sense and control computers and machines. Named so in honor of their Russian heritage.