Don't confuse oyster shell with grit. Grit is insoluble. It stays in the gizzard and it's used to grind food. Oyster shell dissolves in the gut and its job is to add calcium to the diet of laying hens.
Kennedy's strategy of flexible response, managed by Robert McNamara, was aimed to reduce the possibility of war by miscalculation. Kennedy's administration contributed to the peaceful resolution of the Cuban Missile Crisis and refrained from further escalation of the 1961 Berlin Crisis.everal of them were from the foreign policy think tanks. Kennedy had been interested in the issues of war and peace since his youth. In his inaugural address Kennedy encapsulated his Cold War stance as following: Let us never negotiate out of fear. But let us never fear to negotiate.
In the aftermath of the war, the Truman administration had to contend with deteriorating U.S.-Soviet relations and the start of the Cold War (1946-1991). The president adopted a policy of containment toward Soviet expansion and the spread of communism.n November 1, 1950, two Puerto Rican pro-independence activists tried to assassinate President Truman at the Blair House in Washington, where he was living while the White House was under renovation. Truman was unharmed, although a police officer and one of the would-be assassins were killed.