For many, many years in the Signal Corps (in Canada and in the UK) engineering degrees were relatively rare. In addition to rather a lot of OCP (Serving Soldier) types, like me and the friend I mentioned earlier, we had a fair number of Gen Sci degrees (RMC types who found engineering a bit too hard) and one of my classmates (and a damned good regimental officer) had a degree in music (he left the Army after a few years and went to Foreign Affairs where he ended up as an Ambassador to a second rate country).
We did, indeed, have courses to teach us what we needed to know and, for those who needed to know a bit more there were courses in the UK: Long Tels was 22 months long ~ three seven month terms with a two week break separating them ~ which was considered to make one an "engineering manager" which meant the equivalent to a MSCEE and able to supervise ALL engineering officers and warrant officers. (Our Formmen of Signals (WOs who had done their own two year course in the UK) didn't take kindly to being supervised by officers unless they had advanced degrees ... and then not very much.)
It was a very good system ... but expensive. Electrical Engineers and Computer Science grads from RMC are, on the other hand, quite cheap but they need years of "seasoning" in the field before they are useful in a project office ~ see TCCCS for what happens when inexperienced, but very well educated engineers are allowed to mess with user requirements.