WASHINGTON — With drone strikes in the news from Kyiv to Tel Aviv, the Pentagon’s all-service drone defense program just held its most ambitious field demonstration yet, with up to 50 unmanned aircraft of different types converging on a single target at a time.

“Demo Five really was our most challenging JCO demonstration to date,” said Col. Michael Parent, chief of acquisitions & resources at the Army-led JCO, the mercifully short acronym for Joint Counter-small Unmanned Aircraft System Office.