Rank insignia Concept “The Delta Rocker” (Thank you all for the critiques on the previous designs, they helped a lot when it came to designing this one!) : r/SpaceForce
Military rank insignia hi-res stock photography and images - Alamy
A Civilian's Primer on Military Rank and Insignia | The Art of Manliness
US Subdued Rank Pins
FULL SET WW2 US ARMY MILITARY RANK UNIFORM BADGE PIN INSIGNIA LIEUTENANT GENERAL | eBay
My Base Guide - Enlisted Rank Insignia
File:Proposed USSF Enlisted Rank Insignia.jpg - Wikipedia