Originally Posted by xeno000
There are a couple of reasons for the NASA banner. First, that SHIELD installation was part of Project Pegasus, from the comics. In the film Project Pegasus was conducting research with NASA, so the facility was the Joint Dark Energy Mission/Project Pegasus/NASA etc.
Another reason for the name is that Marvel filmed the underground scenes in a NASA facility in Ohio. Marvel made a deal to pay to uses the facility and threw in some NASA branding as a nice bit of PR for the space agency. That huge chamber where Loki first appeared is actually a massive vacuum chamber NASA uses for experiments. They also rent it out for films crews and parties.
I didn't put 2 and 2 together on the Pegasus/NASA relationship. thanks for the clarification.