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.
Naval construction units, known as Seabees, were active in the Vietnam conflict from the very beginning of the American presence there. As early as 1954, the Amphibious Construction Battalion 1 was creating refugee camps in South Vietnam, and between 1962 and 1965 they built camps for the Fifth Special Forces Group.