I can tell you that being a modern day Combat Engineer, there are several other MOS's (job specialties) screaming that they should be awarded the CIB because they may have participated in some engagements. If any other MOS should be awarded the CIB it should be Combat Engineers. It is written in their job description that their secondary mission is to perform as Infantry. This is why they are organized similar to Infantry, ie: Squad, Platoon, Company and so forth. The major difference is that we don't have organic fire support, ie: Mortars, Artilley etc. As a Combat Engineer in the 82nd Airborne DIvision, my Squad and I Jumped in to do a mission with our Infantry counterparts did everything they did until an Engineer type mission came about. Breach an obstacle, recon a bridge, employ a hasty minefield etc. We were often used in the weapons Platoon as we carried a 90mm Recoiless Rifle. I can tell you from personal experience that I performed equal amounts of Infantry and Engineer missions.
Here is an excerpt taken from the 37th EN BN History:
Numerous tales of valor stand out but none more than privates Vinton Dove and Willie Shoemaker, who without concern for their own personal safety, exposed themselves and their bulldozer to enemy fire in order to clear a tank ditch obstacle and cut a lane off of the beach. This lane was the primary exit from the beach on D-Day. Privates Dove and Shoemaker each earned the Distinguished Service Cross for their valor and efforts. The battalion did more than contribute with engineering skills. Three platoons were dedicated as infantry and significantly contributed to the reduction of the pillboxes and machine gun positions on the hill surrounding the beach. 1LT Robert P. Ross, one of the platoon leaders, took charge of an Infantry Company whose commander had been killed. Under his leadership, the infantry company and engineer platoon killed 40 German troops and forced the surrender of two machine gun positions. For his leadership and decisive actions, 1LT Ross was awarded the Distinguished Service Cross. These are only two examples of valorous performance of the 37th Engineer Battalion. Many others remained untold as the unit took the most casualties of any unit in the 5th Engineer Special Brigade.