SAN FRANCISCO–(BUSINESS WIRE)–Elroy Air, a leading U.S.-based technology developer of autonomous heavy-cargo drones for defense, rapid response and commercial logistics, today announced that the company has created three new unattended delivery modes for its Chaparral drone, developed under contract with the U.S. Army. Chaparral can now deliver payloads three ways: precision airdrop from a hover, precision airdrop in forward flight, and ground delivery, each executed without personnel or grou