Military Assistance Command, Vietnam. This was the official name of the US advisory element that existed throughout the war. A soldier was either assigned to a US combat unit or he was assigned to MACV and then sent to a South Vietnamese Army unit as an advisor.
How common is morning sickness? During early pregnancy, nausea, vomiting and tiredness are common symptoms. Around half of all pregnant women experience vomiting, and more than 80% of women (80 out of 100) experience nausea in the first 12 weeks.
Morning sickness usually starts around week 6 of pregnancy and will last until around week 14. Symptoms will vary for each individual but it's usually nausea or a mixture of nausea and vomiting. For some it's the first definitive sign that they're pregnant, albeit not the most pleasant one.