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The second time we heard the noise, about 15 minutes later, we were in DCA. It wasn't as loud as the first time but it sounded similar. Due to a less obstructed view at DCA, we were able to see that what we heard (at least the second time) was definitely a military fighter jet. It appeared to make a wide circle around the park. We couldn't tell if it was following the first sound we heard or if it had made an earlier pass at a lower altitude and that's what we heard. Regardless, I can't figure out at all why a military jet would be circling around this area. It just seemed strange. Still does.
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