The US task force leading the military’s response to the drone threat is ready to spend billions of dollars on contracts for counter-drone technologies, betting that a mixed arsenal will be needed to contend with one of the fast-growing battlefield problems.

Officials said the investment would help scale different technologies so that more federal agencies and military units can get what they need for specific requirements, environments, and threats. The contracts mark the latest step in accelerating the adoption of counter-drone systems, the urgency driven by ongoing conflicts and the rapid proliferation of drones.

On Tuesday, the Joint…