The Pentagon announced on Wednesday that it will add two new types of drones and more networking software to its ambitious Replicator initiative aimed at rapidly putting thousands of drones in the hands of the military.

The announcement marks the most specific details the Defense Department has released about its secretive, fast-track drone effort.

This is just the second time the U.S. has provided specifics on what it’s buying in its move to field thousands of cheap, smart and autonomous attack drones.

The Pentagon, seeking to balance deterrence of China’s Pacific ambitions, industrial base concerns, and secrecy, plans to reveal as soon as this week more details about its “Replicator” drone program. So far, the Defense Department has disclosed one specific system—the AeroVironment SwitchBlade 600 killer drone.

Anduril Industries Ghost-X and the Performance Drone Works C-100 UAS are included in Replicator-1, Tranche 2 (1.2).

Read about the new additions that the DOD has selected for the attritable autonomous systems initiative’s second tranche.