During the heavy fighting in the Battle of the Bulge, the unit suffered many casualties, yet tenaciously held its defensive position.

The 99th Infantry's report stated that 1,500 Jews were "living under terrible conditions and approximately 600 required hospitalization due to starvation and disease."

The 28th Trench Mortar Battery was formed at Fort Sheridan, Illinois, in August 1918 and was assigned to the 174th Field Artillery Brigade, but never ended up joining.

Typically, many of the division's units in Pittsburgh conducted their inactive training period meetings at the National Guard armory in that city.

The division was chiefly manned with graduates of the ROTC programs of the Carnegie Institute of Technology, Duquesne University.

Put under the operational control of V Corps, First Army, it moved to Le Havre, France on 3 November and proceeded to Aubel, Belgium, to prepare to enter the front lines.

The division first saw action on 9 November, taking over the defense of the sector north of the Roer River between Schmidt and Monschau, a distance of nearly 19 miles.

"[1] The inexperienced troops of the division were lodged on the northern shoulder of the Ardennes Offensive on 16 December, unexpectedly facing the advancing German 6th Panzer Army.

The division lost about 20% of its effective strength, including 465 killed and 2,524 evacuated due to wounds, injuries, fatigue, or trench foot; German losses were much higher.

"[7][8] The stiff American defense prevented the Germans from reaching the vast array of supplies near the Belgian cities of Liège and Spa and the road network west of the Elsenborn Ridge leading to the Meuse River.

[9] After more than ten days of intense battle, they pushed the Americans out of the villages, but were unable to dislodge them from the ridge, where elements of the V Corps of the First U.S. Army prevented the German forces from reaching the road network to their west.

Although cut up and surrounded in part, the 99th was one of the only divisions that did not yield to the German attack, and held their positions until reinforcements arrived.

The platoon seriously disrupted the entire German Sixth Panzer Army's schedule of attack along the northern edge of the offensive.

[16] The 99th Infantry's after action report stated they found 1,500 Jews "living under terrible conditions and approximately 600 required hospitalization due to starvation and disease.

A written commendation was received from Maj. Gen. Leonard T. Gerow, V Corps Commander: I wish to express to you and the members of your command my appreciation and commendation for the fine job you did in preventing the enemy from carrying out his plans to break through the V Corps sector and push on to the Meuse River.

Not only did your command assist in effectively frustrating that particular part of the plan, but it also inflicted such heavy losses on the enemy that he was unable to carry out other contemplated missions in other sectors of the Allied front.

Gen. von Manteuffel, commander of the 5th Panzer Army, stated in the address to his troops prior to the attack that "our ground mission must be continuous; otherwise we will not achieve our goal".

Due in part to the 99th Infantry Division, this ground mission has not been continuous, and he will not achieve his goal...[19]The unit's distinctive shoulder patch consisted of a five-sided shield of black on which is superimposed a horizontal band of white and blue squares.

The 99th RSC's mission was to provide command and control and full-service support for assigned units and facility management.

[20] On 23 Dec. 1996, the 99th RSC mobilized the first of six units for deployment to Operation Joint Endeavor in support of peacekeeping missions in Bosnia.

The 99th RSC continued to support operations in the Balkan Republics while providing refuge to those fleeing Kosovo as they sought temporary recovery in the United States.

[20] In 2005, the Army Reserve began its latest transformation under the Base Realignment and Closure (BRAC) directive and lessons learned from eight years of deployments in support of the Global War on Terrorism.

[20] In September 2007, in preparation for the transition to Fort Dix and establishment of the new 99th RSC, the 99th RRC assumed administrative responsibility for the former regions of the 77th and 94th RRCs, which had inactivated.

[20] The U.S. Army Center of Military History states that the 99th RSC does not perpetuate the lineage and honors of the 99th Infantry Division.

While an RSC is allowed to wear the insignia and use the same number as a previous infantry division, it is not entitled to its lineage and honors.