Hercules Inc was formerly called Hercules Powder Company. In 1966 they changed the name.

Below we show an illustration of a rocket engine developed by Hercules Inc. and Thiokol Corp. for the Trident C-4 submarine launch missile.

“Trident C-4 rocket engine”

-The tests for simulating the conditions of high altitude, as shown in the picture above, were made at USAF's Arnold Development and Engineering Center.

-All those attached dark ducts provide the desired density and temperature conditions to the various engine spots.

From Appendix 9: Below we show a list of rocket engines, taken from a new relationship by Mark Wade:

-ABL Snark (Jato)
-C3-1
-C3-2
-C4-1
-C-4-2
-GEM-40
-GEM-46
-GEM-60
-M57-A1
-M5-E1 y M6
-Pegasus 1 (Orion 50S)
-Pegasus 2 (Orion 50)
-Pegasus 3 (Orion 38)
-Pegasus XL-1
-Pegasus XL-2
-SICBM-3
-SR-11
-SR-120
-SR-9
-Talos MK II Mod. 2
-Taurus
-Terrier MK 12 Mod.2
-USRM
-3DS-47000
-BE-3B1
-XM-42