Comment by tasty_freeze

That is a very recent phenomenon. From 1958 until 2019 the US imported more than it exported, including during the Iraq War (both of them).

https://www.eia.gov/energyexplained/us-energy-facts/imports-...

That could flip at any moment based on the price of imported oil vs the cost of domestic production. The US is still very much "investing" in the military to ensure a stable source of energy (as well as other national interests).