Dear Rusty: My husband is 63 and I will be 65 in a few months. He’s retired from the Air Force, so we currently have Tricare Select. As I understand it, I only need to sign up for Medicare Part B, which I think I can do now. Can I do this online, or do I need to go somewhere to enroll? And how do I find the cost? We also currently are enrolled in and pay for FEDVIP for our dental and vision. ...