Already, defence planners are considering whether a drone aircraft should be able to fire a weapon based on its own analysis.

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"He did fire his weapon, yes, " Mr. MacMillan said.

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The investigation will focus on whether the Marines followed procedures to properly fire the weapon, whether there was a malfunction in the firing device or in the explosive mortar itself, the official said.

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When operational, the weapon will fire projectiles at ranges in excess of 200 nautical miles (230 miles) and inflict damage through kinetic energy.

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And while it may well be that background checks will ultimately do more to stop gun violence than the other two, there is simply no argument in 21st century America for anyone to own an assault weapon or magazine clips that can fire more than 10 bullets in rapid succession.

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Soldiers fire a captured M2 60mm mortar, originally a weapon produced by the United States for use in World War II and the Korean War.

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Authorities do not know how William Spengler, 62, who was found dead hours after the four firefighters were shot, obtained the weapon or weapons he used or why he opened fire.

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Kuwaiti, wearing a white shalwar kameez, had grabbed a weapon and was coming back outside when the SEALs opened fire and killed him.

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Even Joan, who fought poachers at her lakeside sanctuary at Naivasha, was in the end gunned down in her bedroom, the automatic weapon fired from so close to the window that the muzzle blast set fire to the curtains.

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For instance, have an area where enemies are very resilient to all damage but fire damage, and certain attacks, so then the player has to figure out a weapon to upgrade to make the area easier to deal with.

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