While I'm not sure of the procedure now, when I was in the Navy, every so often, you got umpteen shots, whether you needed them or not. The carrier pilot in front of me as we passed thru the line asked for a drink of water after receiving what seemed to be at least a dozen different needles.

The Corpsman asked if he was dizzy.

"No, not at all." he replied. "I just wanna see if I'm still water-tight."