In addition to cardiac muscle tissue, the heart wall also contains a dense connective tissue network forming the fibrous skeleton of the heart that reinforces the myocardium internally and anchors the cardiac muscle fibers. This network of collagen and elastin fibres is thicker in some areas than others.
Inactivated in 1946, III Corps was reactivated in 1951 and served on active duty until 1959. Inactivated that year, it quickly returned to duty at Fort Hood during the Berlin Crisis in 1961. In 1962. III Corps was designated as part of the U.S. Army Strategic Army Corps. During the Vietnam conflict, III Corps trained and deployed two field force headquarters and many. combat and combat service support units totaling more than 100,000 Soldiers.
Just one year later, elements of the 5th Special Forces Group began serving temporary duty tours in the Republic of Vietnam. Full deployment of the Group was completed in February 1965. Units from within the Group deployed from its operational base at Nha Trang to the four military regions of South Vietnam.