Question: The Carson River is named for a U.S. what?
Context: The East Fork Carson River is the largest tributary of the Carson River, flowing through California and Nevada in the western United States.  The north-flowing river is 61 mi long and drains a mostly rural, mountainous watershed of 392 mi2 . The Carson River is a northwestern Nevada river that empties into the Carson Sink, an endorheic basin.  The main stem of the river is 131 mi long although addition of the East Fork makes the total length 205 mi , traversing five counties: Alpine County in California and Douglas, Storey, Lyon, and Churchill Counties in Nevada, as well as the Consolidated Municipality of Carson City, Nevada.  The river is named for Kit Carson, who guided John C. Frémont's expedition westward up the Carson Valley and across Carson Pass in winter, 1844. The Carson River Canyon is a scenic canyon in Lyon County, Nevada through which the Carson River flows.  The city of Carson City, Nevada is currently working to purchase 900 acres of the canyon for open space and recreational purposes. Modern Lake Lahontan is a reservoir on the Carson River in northwest Nevada in the United States.  It is formed by the Lahontan Dam, built in 1905 by the Bureau of Reclamation as part of the Newlands Reclamation Act and is located between Fallon, Nevada and Carson City, Nevada.  The flows from the Carson River is augmented by the diversions from the Truckee River.  The reservoir is maintained by the Truckee-Carson Irrigation District (TCID). Luther Pass (el.  7,740 ft. / 2,359 m) is a mountain pass in California in the Sierra Nevada, between the Carson River basin to the southeast and Lake Tahoe to the northwest.  It is traversed by State Route 89 and lies on the boundary between Alpine County (in the Carson River basin) and El Dorado County (in the Tahoe area).  The pass crosses a mountain spur that links the Sierra Crest, the main ridge of the Sierra Nevada to the southwest of the pass, with the Carson Range to the northeast. Monitor Pass (el.  8,314 ft / 2,534 m) is a high mountain pass in California in the Sierra Nevada southeast of Lake Tahoe.  It is traversed by State Route 89 near that highway's southern terminus at U.S. Route 395 near the community of Topaz.  While this section of Route 89 serves to connect the basins of the West Walker River and Carson River, Monitor Pass itself lies on a side ridge between tributaries of the East Fork Carson River.  Crossing the pass allows for a more direct route between U.S. 395 and Markleeville, California, at the expense of some additional elevation. The Carson River Diversion Dam on the Carson River near Fallon, Nevada was built in 1904-05.  It is a 21 ft tall, 241 ft long "concrete gate structure" with 21 "double leaf slide 5 x spillway sections. Clear Creek is a 13.5 mi long stream which begins at 8780 ft on the southern slopes of Snow Valley Peak (Toiyabe National Forest, Carson Range) west of Carson City.  It is the only perennial tributary of the Carson River mainstem, and is protected by The Nature Conservancy.  Its mouth is at its confluence with the Carson River in the southeast portion of Carson City, Nevada. Lahontan State Recreation Area is a public recreation area surrounding Lake Lahontan, an impoundment of the Carson River, located approximately 18 mi west of Fallon, Nevada.  The reservoir is nearly 17 mi long and features 69 mi of shoreline and 10000 acre of water when full.  Most of the park lies below 4000 ft in elevation and is dominated by high desert sagebrush; cottonwoods and willow trees can be found along the shore of the lake.  Primary access points to the park are along U.S. Route 50 near the Lahontan Dam and off U.S. Route 95 in the town of Silver Springs.  A corridor known as Carson River Ranches connects Lahontan with Fort Churchill State Historic Park. Christopher Houston Carson (December 24, 1809 – May 23, 1868), better known as Kit Carson, was an American frontiersman.  He was a mountain man (fur trapper), wilderness guide, Indian agent, and U.S. Army officer.  Carson became a frontier legend in his own lifetime via biographies and news articles.  Exaggerated versions of his exploits were the subject of dime novels.
Answer: Army officer