Vladimir Putin walks past a portrait of Mikhail Kalashnikov

Russian President Vladimir Putin walks past a portrait of Russian firearms designer Mikhail Kalashnikov at a memorial service in Moscow, Russia, Friday, Dec. 27, 2013. Kalashnikov died on Dec. 23 at the age of 94. His work as a weapons designer for the Soviet Union is immortalized in the name of the world's most popular firearm, the AK-47 assault rifle, which is often called "a Kalashnikov." Source: AP