Dragonslayers: Critical Mass Part 1. The Dragonslayer's Saga, #5

Being forced to sit on the sidelines and watch terrorist organizations wreak havoc on the country you swore to defend is not something a warrior handles well. Still, the Dragonslayers are kept from bringing the perpetrators to justice. It's not until the country is shaken to its core by horrific acts of terror that the team's muzzles are taken off, and they're let loose to deal with the situation.
In the meantime, they must work together to save the base from an out-of-control wildfire, rescue hostages from a botched bank robbery, and solve a violent hate crime. However, their worst battles are fought in their minds as PTSD continues to ravage their psyches. Lieutenant Erik Sutton loses his battle and succumbs to the darkness which threatens to end his career, and possibly his life. It's not until help arrives in the form of a biochemical pharmacologist, does Erik, and the team finally find peace with their demons.
But this wizard of alchemy has a dark side, too. Lieutenant Colonel Galen Remington brings everything in his bag of tricks to heal the team. Secretly, however, he's dreamed of being an operator, and this leads to some interesting escapades. Ultimately, it's Galen's thirst for personal revenge which prompts him to create a weapon that will tip the tide of battle in the Dragonslayers' favor.