ROTC

Hi, I'm a sophomore at Stern undergrad planning on majoring in finance. I'm in the ROTC for both personal and monetary reasons. Finance is definitely the most competitive major so I would be better off majoring in econ at Stern if GPA was my main concern. After I serve in military for 4-5 years, I'm planning on getting an MBA. My question is, does GPA matter so much in MBA admissions that I should maybe switch over to econ? Also, would majoring in finance then getting my MBA seem repetitive? How does MBA schools in general view an undergrad finance degree? Any input greatly appreciated. Thanks.