Very good question "the right note" quite right. My experience with the in person interview with Raytheon was made quite straight forward. If you get enough information during the phone screening you will be prepared.
Be yourself, communicate as efficiently as possible, predict the next
line of questions, do not get off track stay technically do not let your guard down.
There will be a few drinks before the reception, to get to know the real you, go with the flow. Be a personable team player and show your can do attitude.
Be excited to be interviewing with them.
They need team players that communicate well, if your are a loner do not even try to get into Raytheon. If you have military experience, do not play it up. It would be best to be a well rounded multiple interests type person.
If you do not click with all the players, try to win over the ones that may not be getting the message that you can help them out.