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.
Location. Both Japan and the US valued the sulfurous island Iwo Jima. Iwo Jima was Japanese home soil, part of Japan, only 650 miles from Tokyo. It was administered by the Tokyo metropolitan government.No foreign army in Japanâs 5000 year history had successfully trod on Japanese soil.ocation. Both Japan and the US valued the sulfurous island Iwo Jima. Iwo Jima was Japanese home soil, part of Japan, only 650 miles from Tokyo. It was administered by the Tokyo metropolitan government.