It all depends on the team, and the graduating senior. Me personally, I'm happy to help other teams, but I will always associate, and consider myself apart of my old team.
Without a doubt though, each student makes an impact on their team.
My team has always given "send-offs" to our graduating seniors by gifting them with collage'd giant posters of the student ranging from the year they joined to the year they graduate, and of course supporting in attendance at graduation.
Retention of seniors becoming alumni is something that ultimately depends on the senior's endeavors and/or continual enthusiasm for FIRST.
I've been two years graduated now, and I'm still trying to find my placing as a mentor... it's SO hard not to touch the robot!!
