The Army has tapped a U.S.-European industry team to design a potentially revolutionary munition that would pair an artillery round with an air-breathing engine to form a kind of quasi-missile to strike targets as far away as 100 kilometers, doubling the reach of current howitzers. The notional new weapon would outmatch anything currently fielded by potential U.S. adversaries, according to an industry official, and give U.S. forces a new counter-battery, anti-armor capability to fight inside a contested environment against near-peer...