Should the United States have based its new frigate on Type 31?
Short answerNo; the stated competition criteria made Constellation the realistic option, while Type 26 was not yet in the water and Type 31 did not fit the requirement.
NotesThe relevant comparison was between the Constellation design and Type 26 rather than Type 31. The US requirement favored a design already in the water, which excluded Type 26 at that moment. Type 31 did not fit the requirement. Constellation was therefore the only realistic option under the stated criteria.