Its not a matter of needing. You only need 1 nomination for an appointment. But getting a nomination doesn't guarantee you an appointment. More than 5000 nominations will be given out. But only around 1000 will be given. A senator or representative will give 10 nominations on average. Only 1 or 2 of those will receive an appointment. Same with your ROTC nomination. You won't be the only person receiving that nomination. And they won't give an appointment to all of you. There for, you want as many nominations as possible. This way, if you don't receive the appointment with one nomination, you have a chance of getting an appointment with one of the other nominations. And if none of them get you an appointment, then you compete nationally with the other thousands of nominees who didn't receive a direct nomination appointment for one of the remaining 300 or so slots to fill the class. So in a nut shell. You want all the nominations you can get. Representative, senator, ROTC, presidential if authorized, vice presidential, and any other youight be eligible for. Your alo can help you determine what your eligible for other than rep, senator, and VP.