Detailed Instructions: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
Q: Which Block I CSM was not launched second?, Context: Two Block I CSMs were launched from LC-34 on suborbital flights in 1966 with the Saturn IB. The first, AS-201 launched on February 26, reached an altitude of 265.7 nautical miles (492.1 km) and splashed down 4,577 nautical miles (8,477 km) downrange in the Atlantic ocean. The second, AS-202 on August 25, reached 617.1 nautical miles (1,142.9 km) altitude and was recovered 13,900 nautical miles (25,700 km) downrange in the Pacific ocean. These flights validated the Service Module engine and the Command Module heat shield.
A:
AS-201