In Puerto Rico it was useful, in Cuba not so much. Cubans perceived the outcome as occupation and didn't want to have United States occupation in their country. Puerto-Ricans had a form of a civilian government with independence and Puerto-rican citizenship but the country belonged to US.
The Soviets were setting up nuclear missiles in Cuba. This meant that they were now able in theory to launch a nuclear missile directly at large parts of the USA and it was therefore viewed as a threat by the USA. I hope that helps.
In the United States, the purpose of the War Production Board (WPB) was to "<span>oversee the conversion of peacetime industry to war industry," since many private business were helping the war effort by producing goods, and the effort needed to be coordinated. </span>
C the reduction of oil drilling
