Pros
West Point will give you the most learning about the product side of the business. The people are kind and you truly will go a full summer learning a great deal.
Cons
I would say in operations, you have less tangible goals than technical operations interns. However, you will actually learn a lot more applicable material to the business than you will in tech ops, who get a very sugar coated version of the day-to-day of a Merck employee. The pay is slightly less competitive than other companies hiring engineers but you get a lot of benefits in the long term.