[R-DEV]Eddie Baker wrote:Spearheads or assaults at the beginning of a war . . . I see. Such as the "Marine" 75th Ranger Regiment parachuting into Afghanistan (and Grenada and Panama), the "Marine" VIIth Corps and XVIIIth Airborne Corps leading the push into Iraqi territory in 1991, and those "Army" peacekeeping troops in Beirut in 1983, when a huge push wasn't required.

The Marines, however, were first into Kuwait City.
As I said before, it depends on the storyline.
Grenada
After the rangers had secured the runway, 800 more troops would land, freeing the rangers to press northward where they were to secure the safety of American medical students and bring under control the capital of St. Georges. At the end of the first day in Grenada, the Rangers had secured the airfield and True Blue Campus at a cost of five dead and six wounded. Once the Rangers had secured the runway, elements of the 82nd Airborne Division landed, and late in the evening of the 26th the 82d Division's 3d Brigade began to deploy across the island. In the north, 400 Marines would land and rescue the small airport at Pearls.
There is a difference between being first on the ground, and spearheading a main force. The Marine Corps is spearheading a main force there, but it was also a join operation, so the Army and other units were doing their part as well.
And talking about the current, when the war in Afganistan broke out, the Marine Corps was one of the forces which attacked from the sea and went pretty far inland, which was unusual for the USMC up to that point. So if you don't consider that a spearhead(from the sea to the mainland), then I don't know what is.
and those "Army" peacekeeping troops in Beirut in 1983, when a huge push wasn't required.
Not sure what you mean here, the USMC was the peacekeeping force in Beirut.
The Marine Corps needs the Army to help sustain itself for long durations or spearheads, but even the Army agrees that the Marine Corps is a spearhead force. The Army's main job is to occupy, the Marine Corps main job is to spearhead and then go on its way like with Fallujah etc. But if the Army is currently occupying an area and needs to clear something out, of course they will probably do it. But that would usually be a specialized unit like the Rangers or Airborne, not the regular Army forces.