Aberdeen Proving Ground (APG)
U.S. Army Research Laboratory (ARL)
Defense Information School
Kirk U.S. Army Health Clinic
U.S. Army Aberdeen Test Center (ATC)
Fort Detrick
USAMRMC Office of Research and Technology Applications (USAMRMC ORTA)
USAMRMC Chemical Biological Defense Partnership Support Directorate (USAMRMC PSD)
Fort Meade
Kimbrough Ambulatory Care Center (KACC)
U.S. Army Center for Health Promotion and Preventitive Medicine (USACHPPM)
U.S. Army Center for Environmental Health Research (USACEHR)
U.S. Army Environmental Center (USAEC)
U.S. Army Medical Research and Materiel Command (USAMRMC)
There are none to name.
There are a number of current active duty US Army Air Cav units. You may look at the web sites of individual posts for specific units for specific contact information. Try the US Army web site at http://www.army.mil/info/organization/installations/forts/ for a start. You can look at individual posts linked on this page.
During the US Civil War, the mutual combatants' armies were named the Union Army and the Confederate States Army.
There are three types of US Army intelligence functions. There are strategic, operational, and tactical.
Maryland is in the US not in Canada.
I'm not sure what you mean by names of major highways, but here are some of the major route numbers. I-95, I-495, I-695, I-795, I-70, I-68, US-140, US-40, US-1.
The Department of the Army is headquartered within the Pentagon in Washington DC. There are US Army posts scattered throughout the United States and in other parts of the world. Specific branches of the Army are headquartered at installations within the US and locations in other countries. There are hundreds, perhaps thousands of locations worldwide. For specific headquarters, see the link below.
Persons in the Army are called Soldiers. there is the USMC and the SAS and although the have them names altogether, they're call solders.
The US Army and US Navy didn't exist back then. So everything was called the "Continental Army" and probably the "Continental Navy and Marine Corps."
Gunnery Sergeant and Lance Corporal are names of ranks used by the US Marines. The Question was about the US Army.
Michigan, Maine, Mississippi, Missouri, Montana, Massachusetts, Maryland, and Minnesota.
Most of the helicopters designed for US Army have American Indian names