I can't speak for the scholarship boards, but I can speak from life experience. I started college in 1978 as a chemical engineering major. I now work for an IT company as a clinical expert for the R&D people. Somewhere along the way, the chemical engineering turned into a graduate degree in nursing. Trying to guess at 17 what looks like a good career 40 years from now is more ridiculous in 2017 than it was in 1977.
In truth, most junior officers don't use the technical parts of their major - they start as low level managers of the military mission, and will need a refresher on state-of-the-profession if and when their chosen branch decides they need an engineer/computer scientist/programmer, given the explosion of change in the age of information. A 2 LT will not be designing aircraft engines for the military (Boeing does that), but he will be handling the administrative details for the Company s/he's assigned to.
TLDR: If you have a STEM major, the flavor doesn't matter.