LITTLE FALLS — The Minnesota Military & Veterans Museum will open its new 40,000-square-foot facility during a three-day grand opening weekend, Sept. 11–13. The celebration will mark the 25th anniversary of the events of Sept. 11, 2001, and include an address by retired U.S. Army Gen. Paul M. Nakasone. There also will be veteran-guided land, sea and air experiences, narrated historic warbird flyovers, family activities, historical re-enactors, c…