I found a deal on a two year subscription to Kindle Unlimited that I don't think I can share because I think it's an affiliate link (but I digress) and just started the Legacy Fleet series by Nick Webb.
The promo blurb from the first book
Quote:
The year is 2650
75 years ago, an alien fleet attacked Earth.
Without warning. Without mercy.
We were not prepared.
Hundreds of millions perished. Dozens of cities burned.
We nearly lost everything.
Then, the aliens abruptly left.
We rebuilt. We armed ourselves. We swore: never again.
But the aliens never came back.
Until now.
With overwhelming force the aliens have returned, striking deep into our territory, sending Earth into a panic. Our new technology is useless. Our new ships burn like straw. All our careful preparations are wasted.
Now, only one man, one crew, and the oldest starship in the fleet stand between the Earth and certain destruction:
ISS CONSTITUTION
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https://www.amazon.com/gp/product/B074CHHFHG/