Re: MCU-ize Marvel Characters
The organization of SHIELD has not existed as long as many people think it has. It's earliest forerunner, the Strategic Scientific Reserve, SSR, was founded to oppose first the Thule Society, and the more more aggressive Hydra organization coming out of Nazi Germany. After the war ended, the SSR was severely gutted, leaving only the very best scientific minds, including those of Howard Stark and Albert Einstein. It went through several name changes, and folded in different fields, Including a group set up to attempt to replicate the success found in Captain America, a group called "The Weapons Plus Program". Details on the project are SHIELD Classified "Eye Only".
The name SHIELD (Strategic Homeland Intervention, Enforcement, and Logistics Division) came was applied in 2003, after the catastrophic events of the Weapon's Plus Program when it was re-initialized by General Thadeus "Thunderbolt" Ross. Ross ordered unethical tests that created the first confirmed meta-level threat since the end of WWII (The being on file as "The Hulk"). SHIELD was given the job to research what happened and file what happened. The new organization pulled from the best top level espionage, intelligence, and research groups in the country including United States Army Research, Developement, and Engineering Command had already been fine tuning the Helicarrier technology and the put their prototype (mothballed for budgetary reasons) into service for SHIELD. With labs working with direct feed back from field agents, weaponry became more advanced more quickly.