Switching on radar, or an anti-aircraft gun firing a single salvo, now brings down a hail of bombs on anything deemed threatening, from command bunkers to radar stations, and even anti-ship missiles.

ECONOMIST: Why the bombs are falling on Iraq

Mr. Pride chose to shoot, firing a single shot that killed Officer Peter Figoski in the early morning hours of Dec. 12, 2011, prosecutor Kenneth Taub told a jury on the first day of a joint murder trial against Mr. Pride and Michael Valez, the alleged getaway driver that night.

WSJ: Trial Opens in Slaying of Officer

In one famous raid in late 2003, Petraeus' forces arrested some three dozen insurgents firing just a single shot.

NPR: White House Shuffles Its Leaders on Iraq, Security

But Van Persie single-handedly made up for it by firing in one of the strikes of the season four minutes after the restart.

BBC: SPORT | Football | Premiership | Charlton 1-2 Arsenal

Earlier this week Wilson posted a video online showing a single shot being fired from "The Liberator, " a plastic handgun that, with the exception of a metal firing pin and a piece of metal included to comply with the Undetectable Firearms Act, was assembled entirely from parts made with a 3-D printer.

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