HOUSE OVERSIGHT 025058 were made by different battalions that appear to operate with little central command and control. The gains include: *The al-Jarrah air base, about 30 miles east of Aleppo, which appears to have been overrun by fighters from Ahrar al-Sham, a battalion based in Idlib. Videos posted Tuesday by the rebels showed them walking past derelict Syrian warplanes and inside a fortified hangar containing what appeared to be two Czech-built ground assault planes. On camera, the rebels displayed dozens of bombs racked in a warehouse, and other ammunition and spoils of war. *The Thawra hydroelectric dam on the Euphrates, which is one of Syria's biggest power-generating facilities. Rebel sources said the Syrian army gave up the strategic dam after army positions there were overrun. The rebels negotiated a surrender with regime loyalists who remained. These sources said the dam continues to operate and provide power — a positive sign for those who worry that Syria's infrastructure would collapse if the rebels took over. *The Aleppo International Airport, southeast of the city, is close to falling. Free Syrian Army sources said Tuesday that their fighters, including allies in the extremist al-Nusra Front, had captured an access point near the airport known as "Liwa 80." Syrian sources said rebels there