Can you wear the BS on the ICM if you were awarded the Global War on Terrorism Expeditionary Ribbon during the dates?

Let me get your question straight. You are asking if I earned the GWOTEM during period A, and I earned the ICM during period B, can I wear the campaign stars from period A? The answer is no. I had to get this clarified with my J1 many years ago, and the link below answers that question.

Block 2E states: Soldiers that elect to receive the GWOTEM in lieu of the ACM or ICM are not authorized service stars for those campaigns in which the GWOTEM is awarded.

Q14 also states: Bottom line, Soldiers do not receive campaign stars for the ICM/ACM for any period for which they were awarded the GWOTEM.

https://www.hrc.army.mil/tagd/global%20war%20on%20terrorism%20expeditionary%20medal%20gwotem%20and%20global%20war%20on%20terrorism%20service%20medal%20gwotsm

Just for clarification and to ensure our junior Soldiers are educated...the device that's worn on the Iraq Campaign Medal and the Afghanistan Campaign Medal is the Battle Star (bronze or silver). (AR 600-8-22, para 2-18f)

Depending on the award and the manner in which they are used, they may also be referred to as campaign stars or bronze/silver service stars.

Bronze and silver 3/16 inch stars are sometimes confused with individual decorations such as the Silver Star medal and the Bronze Star Medal.

The Silver Star and Bronze Star Medal are separate, distinct awards.

DOD Release ‪#‎NR‬-042-15, 9 Feb 2015, authorized service stars for the Global War on Terror Expeditionary medal.

OEF 11 Sep 01-TBD
OIF 19 Mar 03-31 Aug 10
ONS 5 Nov 07-TBD
OND 1 Sep 10-31Dec 11
OIR 15 Jun 14-TBD