There are 4 books in the Dead Six Series series. The newest book is Invisible Wars which came out in 2019.

1
Dead Six

By Larry Correia , Mike Kupari,

Book cover of Dead Six
Michael Valentine, veteran and former member of an elite private military company, has been recruited by the government to conduct a secret counter-terror operation in the Persian Gulf nation of Zubara. The unit is called Dead Six. Their mission
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2
Swords of Exodus

By Mike Kupari, Larry Correia ,

Book cover of Swords of Exodus
A master thief and a hardhitting mercenary team up to defeat a Central Asian warlord with world-wide destruction on his mind in Swords of Exodus, the sequel to Larry Correia and Michael Kupari's thriller Dead Six!

3
Alliance of Shadows

By Larry Correia , Mike Kupari,

Book cover of Alliance of Shadows
BOOK THREE IN THE COLLABORATION BETWEEN the creator of the multiple New York Times best-selling Monster Hunter series Larry Correia and the best-selling science fiction author Mike Kupari. The Dead Six series is an inventive and action-packed military adventure series with a touch of conspiracy and big dollop of descriptive…

4
Invisible Wars

By Larry Correia , Mike Kupari, Peter Nealen

Book cover of Invisible Wars
The Dead Six series is an inventive and action-packed military adventure series with a touch of conspiracy and big dollop of descriptive firepower! Now, for the first time, all of the Dead Six novels are available in a single omnibus edition. Inside you will find:

Dead Six: Michael Valentine has…