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.
Linked to this, was the destruction of Japanâs remaining industrial base by the bombing of it by the American airforce. Iwo Jima is a very small Pacific island â just over 4.5 miles long and 2.5 miles wide which lies at the foot of the Bonin chain of islands, south of the main Japanese island of Honshu. Despite its size, Iwo Jima was considered to have great tactical importance.