Fan Casting Captain America: Shell-shocked

Frank Simpson was an American soldier who served in the Vietnam War. Frank was given the same Super Soldier Serum that was given to Steve Rogers during World War II, effectively recreating Captain America in Steve's absence. However, Frank's handlers failed to fully recreate Captain America. So, instead, Frank was painfully augmented with cybernetic implants and steroid supplements to compensate (which began the gradual decline in his sanity). After being deployed to Vietnam, he participated in the most dangerous battles such as Dak To, Khe Sanh, and the A Shau Valley for five years.