I may not have the same WD Circular 186 as you, because I do not find the requirement for MOS of an infantryman. The requirement to be assigned to an infantry unit is valid, but has been wavered numerous times during WWII.
The 56 officers assigned to 540th Engineer Regiment were awarded by mistake? How was Colonel Marvin able to order the awards with the Adjutant authorizing. Furthermore, the General Order Number 24, dated 13 October 1944 was accepted by the Adjutant General, Washington, D.C., Attention: Awards & Decorations Branch; the Commanding General NATOUSA, Personnel branch, AGO Section; and the Commanding General 7th Army, AGO Section. Were they all wrong?
I believe I presented ample evidence that the CIB was awarded to hundreds of WWII combatants in accordance with. I can accept the recommendation by General Truscott. I gather between the lines you do not. Have you ever heard of wavers being applied? According to evidence they were.
Finally, I am waiting patiently for a response to my letter from an authority even you will not deter. It will settle the disagreement one way or another.
Robert