This topic is debatable. And many have debated it. Some think that you should have a lot of pride in being in CAP or JrROTC, and therefor should wear your uniform. I disagree. The only person I believe who should wear their uniform is an active duty military enlisted person. 1) They will be doing some interviews possibly with their commander or similar, so their military uniform is the norm. Also; any other interviews it's appropriate because you ARE in the military. Thus, a military uniform is appropriate.
CAP and JrROTC are NOT military. Some may believe it is a pseudo branch of the military, but it isn't. To wear your CAP/JrROTC uniform would, in my opinion, seem presumptuous and give the impression that somehow you feel you are already part of the military and should be recognized as such. Same with wearing a Boy Scout uniform. If you worked part time at Burger King and had a professional attire for that, would you wear that? I always suggest wearing shirt/tie (Jacket if you have one). Ladies; business attire or nice skirt/dress non-formal business looking. This is basically the Job Interview of your life. Treat it as such. But I don't recommend wearing a CAP/JrROTC uniform. What are you trying to show/prove? Your resume/application already says you're in CAP/JrROTC. You don't need to show them. And you definitely don't need to give an impression of: "See, I wear a uniform too. I'm just like the military."
Anyway; that's always been my opinion. And always will be. But there are some that will disagree and debate my opinion.