currently looking at a branch change myself 5 years post IOT if you feel happy doing what you have been offered then go for it.It is very difficult ti change branches because the airforce is so short of people. several friends have been refused on the gounds that although they are suitable candidates it would increase the shortage in the branch they are leaving. be sure you are doing what you want if you get to IOT an want to change then register your desire with the relevant people.If you fail first time they is always post IOT and it doesn't hurt to have registered an interest already. do know 4 poeple who got a branch change during the last week of IOT but don't hold out any hopes.any way enough blah good luck and enjoy IOT it is good fun.