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.
The Battle of Iwo Jima was the American capture of the Japanese island of Iwo Jima during the Pacific Campaign of World War II. The USA needed to capture Iwo Jima to be able to defeat Japan. Many films were made about it for example Flags of our Fathers and Letters from Iwo Jima, both directed by Clint Eastwood.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.