It is true that per the applicable CFR any eligible nominating authority in your state may nominate your rising Junior. That said, many of the MOC and/or their boards do not necessarily know this, and of those that do many others choose or strongly prefer not to nominate someone outside of their own Districts. Additionally, the truth is that, as I understand it, there really is effectively no significant difference between any of the nominations, e.g. "Principle", first alternate, etc. - all ten nominations of each Member of Congress in a State compete for that States available spots on equal footing with each other first and then in the National Pool after that. At least that's my understanding of how it is but you should be able to: 1) ask the Nominating Authorities in your State (Congressional and Senatorial Offices) their policies and understanding for how they choose to apply the available leeway in the CFR re: USMMA nominations; and 2) Query the USMMA Admissions Office how the assessment of the nominated, completed applications is handled vis-a-vis' the rolling admissions process and offers of appointments for each state, in particular yours, as truth is competition once you get below the top 5 - 10 States sending people to the last 5 or so entering Classes at least it used to be, if your PC is truly highly competitive you only need one, not multiple, nominations to complete your application and have the same chance as you otherwise would have at being offered an appointment to the Class of 2020. All that said I strongly recommend you complete your research as to the evaluation process - there's a fair amount of information available on line as a couple of years ago there was a lawsuit filed about the selection process and the information available as a result of that makes the USMMA selection process even more transparent than even the other SAs. Then call or email your specific questions to both your MOC's constituent services POC and your regions Admissions Officer at the USMMA Admissions office since your question is timely. Good Luck!