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.
Iwo Jima was important for two reasons. It was an air base for Japanese fighter planes and it was a safe place for Japanese ships. In addition, it was used by the Japanese to do air attacks on the Mariana Islands.t was major battle in which the United States Armed Forces captured the island of Iwo Jima from the Japanese Empire. The Americans wanted to capture the island, including its three airfields. The US wanted to use this area for attacks on the Japanese main islands. This five-week battle had violent fighting.