The showcase at the central Lielvarde airbase comes as tensions run high in the Baltic states -- Estonia, Lithuania, Latvia -- with neighbouring Russia over its role in the Ukraine conflict.
"It's important to train for interoperability between NATO partners," Latvian President Raimonds Vejonis told AFP at the event.
"It's a good example of smart defence that we can use equipment that we don't currently have," he said, adding Riga is considering buying its own drones without specifying which.
But the current deployment is due to last just two weeks and involves familiarising intelligence staff from the Baltic states, Poland and Germany with the system.
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The two pilotless drones -- which have a range of 2,000 nautical miles and a top speed of 135 miles per hour -- performed a series of flybys at the showcase also featuring A-10 "Warthog" ground-attack craft.
Though the two drones in Latvia are weapon-free, they are capable of carrying armaments including Hellfire missiles as well as carrying out intelligence and reconnaissance missions.
The three Baltic states regained their independence in 1991 after 50 years of Soviet occupation and joined NATO in 2004.