Global AI, a U.S. company that builds single-tenant, air-gapped data centers for governments and enterprises, has closed $441 million in financing, its first-ever debt raise. The senior secured credit facility was led and arranged by J.P. Morgan, with participation from a group of lenders the company did not name. The announcement lands the same week another GPU infrastructure operator, Nscale, lined up a $900 million credit facility from a lender group that also included J.P. Morgan — two…