Northrop Grumman Corp.’s new 400,000-square-foot Aircraft Integration Center of Excellence in St. Augustine — which will eventually add 400 jobs and more than $100 million in capital investment — will be completed by next year. The center at the St. Augustine campus is one of five to be built in the nation, increasing the local defense contractor’s workforce to 1,400. “This is going to have a dramatic impact for 400 families in this region of Florida,” Gov.