Requirements are prioritized to determine which requirements will be included and excluded from the project. Rationale/Purpose Defining requirements specifies the capabilities, features or attributes of the projectâs deliverables.
On January 31, 1917, Germany, determined to win its war of attrition against the Allies, announced it would resume unrestricted warfare in war-zone waters. Three days later, the United States broke diplomatic relations with Germany, and just hours after that the American ship Housatonic was sunk by a German U-boat.
, a shortening of Unterseeboot, literally undersea boat. While the German term refers to any submarine, the English one (in common with several other languages) refers specifically to military submarines operated by Germany, particularly in the First and Second World Wars.n the early stages of the war, the U-boats were extremely effective in destroying Allied shipping, initially in the mid-Atlantic up until 1942 when the tides changed, where there was a large gap in air cover.