Castelion was formerly known as Pallas Industries. Castelion is a defense manufacturer working to significantly reduce the cost and schedule required to field new long-range strike weapons through hardware rich development, vertical integration, and high cadence testing. Headquartered in El Segundo, California, and with facilities in Allen and Midland, Texas, Castelion is currently testing prototypes of its first product with long-range flight demonstrations planned throughout 2025.