Once soldiers signed up, they were in it indefinitely. Some soldiers fought for up to three years. The style of warfare, along with indefinite lengths of service was tortuous. Even if a soldier managed to finish the war alive and unwounded, the mental stress of the war continued.
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For US personnel, in the Army Air Force at the outset bomber crews were asked to complete 25 missions, but by the last year or so of the war this was increased to 35 as the opposition dwindled and better escorts enhanced the survival rate. Many volunteered for a second tour after finishing the first. Fighter pilots generally had no set amount of hours or missions. In the Navy, sailors sailed until victory or their ship was sunk. The Marine Corps did all its fighting in the Pacific, against the Japanese. A man who had survived three campaigns was sent home, for a time at least, though not discharged, so combat veteran Marines started getting rotated back to the states by mid 1944. There were more than 16 million Americans in uniform for WWII, and over half of these served in the US Army. For Army troops sent overseas there were only a few ways out - victory, death, incapacitating wound (or accident, or disease), or cracking up mentally. Even fairly seriously wounded men were hustled right back to the front as soon as they were just about healed, unless they had been permanently injured in some way that meant they could no longer perform as infantrymen. A very large number of WWII infantrymen had multiple awards of the Purple Heart.
While most ships only carried supplies for a month depending on the mission and if they remained undamaged in battle their tour of duty could last several weeks or months without returning either to their home port of call or without liberty even when resuppling at another port the sailors had to remain aboard ship
It was the first victory that the continental army had after a string of crushing defeat in Boston. the soldiers moral and inspired many to reenlist in the army for another tour of duty.
people was trying to save the world and a tornadao came and tour the houses down
When referring to the US casualties, some men were hit within 30 days of in country duty (after the 1 to 2 week RVN orientation-Republic Vietnam Orientation). Some GI's were hit with less than 30 days remaining of their tour. Those men were called "short timers", and as time passed, the Army often went out of their way to assign those GI's to rear area duties.
For US Airmen, US Sailors, Marines, Coast Guardsmen, it may have been different. But for US Soldiers it was a one year tour of duty. Second and third tours were in six month increments. So, for a GI (US soldier) three tours meant 2 yrs.