APOLLO 13 "The Eagle Has Landed" 25th Anniversary Poster Vintage 18" x 24" Original Commemorative Poster, Copyright 1984 TRW Inc. TRW designed and built the descent engine or (LMDE) for the Apollo lunar lander. Due to the need for a soft landing on the Moon, it was the first throttleable engine for crewed space flight. This, and the requirements for high thrust, low weight, and crushability (in case of landing on a large rock), earned surprising praise from NASA's history pages, considering the complexity of the lunar missions: "The lunar module descent engine probably was the biggest challenge and the most outstanding technical development of Apollo". This engine was used on Apollo 13 to achieve free return trajectory and make a minor course correction after damage to the Service Module. The poster is complete and in FINE condition with some overall wear mainly in the folds of the poster where there are several small holes and some color loss. It is folded into six (6) sections.