ATK - (Alliant Techsystems). Manufacturer of solid-fuel rocket engines like Orion or Castor.

-These engines were used as main engine for dropping vehicles for small satellites from aerial platforms like the case of Pegasus XL, which is done from a B-52.

"Pegasus XL with ATK"

-The "boosters" used in the Japanese H-IIA rocket with Castor IV-A-XL solid fuel engines.

"Cohete H-IIA"

-The Alliant Techsystems boosters (SRMU) have also been used in Delta, Taurus, Atlas and Titan rockets.

-They Investigate with "scramjets" and comes together with Thiokol, Advanced Propulsion, Space Systems, etc.