The hemoglobin is checked before each donation to. ensure that the donor has adequate red blood cell levels to donate blood. Blood donors must have a minimum of 12.5 g/dL hemoglobin or a hematocrit of 38% to be accepted for donation. The hematocrit is a measure of the volume that red blood cells take up in the blood. Most men have a hemoglobin of 12.5 g/dL or greater and a hematocrit above 38 percent, but many women naturally have lower hemoglobin/hematocrit levels.
Iwo Jima, which means Sulfur Island, was strategically important as an air base for fighter escorts supporting long-range bombing missions against mainland Japan.ecause of the distance between mainland Japan and U.S. bases in the Mariana Islands, the capture of Iwo Jima was necessary to provide an emergency landing strip for crippled B-29s returning from bombing runs.
Raising the Flag on Iwo Jima is a historic photograph taken on 23 February 1945 by Joe Rosenthal. It depicts five Marines and a U.S. Navy corpsman raising the flag of the United States atop Mount Suribachi. The photograph was extremely popular, being reprinted in thousands of publications.he Americans on the ground were supported by extensive naval artillery, and by the complete supremacy in the air over Iwo Jima commanded from the beginning of the battle by U.S. Navy and Marine Corps aviators. American firepower from the sea and the air upon the Japanese troops was enormous.