A bit more info here. Wrote to my friend at the Army Corps of Engineers. This is what he said:
Dear Marion,
Here is the current regulation regarding the CIB. It seems to confine the award to infantrymen, but with some possibilities for soldiers in other branches. Your best bet is to contact the Army's Institute of Heraldry. I found no e-mail address, but here is how you can reach them:
Institute of Heraldry
9325 Gunston Road, Room S-112
Fort Belvoir, Virginia 22060-5579
(703) 806-4972
I'd be interested in learning what you find out. Incidentally, some time after WWII, CIB awardees were entitled also to the Bronze Star Medal. A couple of men I know who served in the war were surprised to find that they were eligible for the medal. One was delighted, the other thought it was quite unnecessary.
Mike
For more info on the CIB read this link: Combat Infantry Badge
Proud Daughter of Walter (Monday) Poniedzialek
540th Engineer Combat Regiment, 2833rd Bn, H&S Co, 4th Platoon
There's "No Bridge Too Far"