Of course there was ammo there. It was locked up for security reasons.
After 9/11 I was put on guard duty at the front gate of Yongson Army base in Korea. I had my M16 but no ammo! My SSG at the the time said, “The terrorist won’t know that you have no ammo”. To which I replied, “They will when they start shooting at me!”
The Marines were not denied the ammo. As soon as they filled out the appropriate form and checked the “dire immediate need” box, their request would be processed.