When arriving at JFK terminal 3 do you have to exit the terminal to get to Terminal 2?

Yes, when arriving at JFK Terminal 3, you will have to exit the terminal to get to Terminal 2. The two terminals are not directly connected, so you'll need to go outside and follow the signs for Terminal 2. It's advisable to allow some extra time for this transfer. However, terminal operations may change, so checking for the latest information upon arrival is a good idea.