All Navy officers need to “express themselves, orally and in writing,” extremely well, as the phrase often goes, regardless of undergraduate majors, post-grad degree or warfare specialty.
Professional reports, evaluations, fitness reports, issue papers, briefings, point papers, memoranda, white papers, detailed analyses, proposals, letters, policy statements, speeches, presentations, after-action reports, investigations, safety debriefs, JAGMAN investigations, standing night orders, etc. - there is a lot of that. A lot. It quickly becomes clear that is a skill that makes JOs stand out from each other.
DS should major in what he enjoys. If he does well in STEM classes, all doors will be open to him. The USNA B.S. is a solid foundation.
Of the history majors in the sponsor alumni family, one graduated in the single digits in the class, became the #1 junior SWO on his ship and went on to become a JAG via the LEP program. Several have gone subs, aviation and a few Marine ground. One to med school at Duke.
Now, if the mid completely envisions him or herself pursuing engineering-related careers post-military service, that’s another thing. Engineering-management roles - much more flexible, especially with regard to SA B.S. degrees.