@Sam Manhwa is discontinued in country of origin, at Ch 50. There is a novel, complete at 200 chapters. https://alandal.com/series/novel-the-iron-blooded-necromancer-has-returned has the official English translation. I can't find a scanlation translation.
https://www.mangaupdates.com/series/6tpxfh0/the-iron-blooded-necromancer-has-returned
https://www.mangaupdates.com/series/6tpxfh0/the-iron-blooded-necromancer-has-returned
The Galactic Navy Officer Becomes an Adventurer
by Takuma Tomomasa , A_Itoh
Available on mangabuddy for reading, and for sale at https://www.amazon.com/dp/B0BT6V7CMM
by Takuma Tomomasa , A_Itoh
Available on mangabuddy for reading, and for sale at https://www.amazon.com/dp/B0BT6V7CMM