KeyBanc downgraded Rocket Lab (NASDAQ: RKLB) from an Overweight rating to a Sector Weight rating, signaling potential challenges ahead.Rocket Lab reported a record-breaking third quarter with revenue of approximately $155 million, the highest in its history, and a significant contract from the U.S. Space Development Agency.The company's contracted backlog has surged to$1.1 billion, with management expecting to recognize about 57% of that amount soon, indicating strong future revenue potential.Rocket Lab US ...