Only 50 C-133 Cargomasters were built, and just one wore NASA markings for Apollo Earth Landing System testing: C-133A S/N 54-0136, better known as NASA 928.

54-0136 served with NASA as NASA 928 during the Apollo program and was specially modified to support Earth Landing System testing. The aircraft carried full-scale boilerplate Command Modules beneath its fuselage and released them over the parachute test range at Naval Air Facility El Centro, helping engineers develop and validate the system that would ultimately return Apollo crews safely to Earth.

This is an original Northrop Ventura video covering the ELS and shows NASA 928 dropping a boilerplate over El Centro. Project Apollo : Last Five Miles Home

Additionally, here is NASA link covering the ELS: 60 Years Ago: Apollo Parachute Development and Testing - NASA

JETs Vol. 26-25 features rudder and engine-door skin cut from 54-0136. The aircraft has been stored at Mojave for decades and used as a source of spares; the components used for this run had already been removed from the aircraft and were no longer viable for preservation on the airframe. The JETs will be offered in 9 variants, including some hefty Structured JETs. Many colors are very limited. Structured JETs are a random mix of colors and could be any combination. The Black/White JETs have been cut from the "C" in the MAC stencil on the tail. 

Only 300 JETs have been for Vol. 26-25.