Impromtu Air Show

When you live sandwiched between several military installations you never know what you might get to see. This afternoon was no exception. Pedro and I were outside enjoying the cooling autumn like weather and a very large noise came from overhead. I started eye-ing the sky and there they were. Two large Air Force planes flew over, the larger one following the smaller one very closely. It was several passes over us before I could figure out what they were doing. From these best-I-could-take pictures, what do you think they are doing?

Any ideas? Both planes had 4 engines, one looked to be at least a big cargo plane.

The only thing I could come up with was re-fueling practice runs.

Pedro was so excited he spent his time exploring the neighbor's stairway.