RIGA, Latvia — NATO is setting up a marketplace where alliance members can shop for counter-drone systems — a pilot project within a broader push by the organization to speed up procurement and help countries adopt new technology more quickly.The alliance has invited companies to pitch counter-unmanned aerial systems, or C-UAS, by mid-May, and will pick 18 systems in the next one to two months, said Claudio Palestini, NATO head of innovation and…