Nathan J Allison Brothers to the Bone Series books
The first seven books of the series are set in Vietnam. The characters are mostly Long Range Reconnaissance Patrol operators, along with support personnel and some other peripheral but important characters in their lives. The first book of the series is Dancing With the Darkness, Third Edition. It is 99 cents on Kindle and six more novels follow that vein. A new direction for the series is charter in Afghani Peril and Rubicon Double Cross both set mainly about operations in Afghanistan.