For 10 points, name this German city that was once bisected by a namesake Wall.
This city was aided in an operation created by Lucius Clay. Operation Clausewitz was an attempt to defend this city, which is where Yevgeny Khaldei took a photo of two soldiers raising a Soviet flag over a government building. A 1961 tank standoff occurred when one of this city's four zones was blocked off. After Soviet troops blockaded the supply routes in this city, a 1948 (*) airlift was organized to deliver necessities to it. That structure was built by Walter Ulbricht and included Checkpoint Charlie. Ronald Reagan gave a speech telling "Mr. Gorbachev" to "tear down" a structure in this city. For 10 points, name this German city that was once bisected by a namesake Wall.
This city was aided in an operation created by Lucius Clay. Operation Clausewitz was an attempt to defend this city, which is where Yevgeny Khaldei took a photo of two soldiers raising a Soviet flag over a government building.
Berlin [accept East Berlin or West Berlin; accept Berlin] &lt;LL&gt; Tiebreaker