The experiment which created Captain America was very very sensitive. So why wasn't it performed in a secure military base?
While the experiment base was hidden well in the city, it still had only minimal protection encouraging foes to steal the serum. A highly secure military base should have prevented a bomb and pistol from getting inside. And the guest would never think of escaping a military perimeter (and the serum might have been saved even if it was taken).
Why exactly was the experiment not performed in a secure military base?