Re: [R] Selecting columns of a table (not consecutive) >I have a table with 10 columns and many rows. >I want to select the 3rd,4th and 10th column. >problem.
There are three Military Departments within the Department of Defense: the Department of the Army, which the United States Army is organized within. the Department of the Navy, which the United States Navy and the United States Marine Corps are organized within.
The U.S. Air Force was also created, along with a new Department of the Air Force. The War Department was converted to the Department of the Army. Finally, the three services, Army, Navy, and Air Force, were placed under the direct control of the new Secretary of Defense.he Department of the Navy, was founded in 1798. The Coast Guard (part of Homeland Security in peacetime), can trace it's history back to 1790. Congress, in 1947, established a civilian, Cabinet-level Secretary of Defense to oversee an also newly created National Military Establishment.