Pure as the driven snow.
https://www.amazon.com/Level-Zero-Heroes-Operations-Afghanistan/dp/1250030404
For anyone interested in more information about JTACs check out one of my favorite books, titled "Level Zero Heroes" by Staff Sergeant Michael Golembesky, a MARSOC JTAC. (Amazon link.)
Level Zero Heroes is a first hand account of a MARSOC team's deployment to Bala Murghab in Afghanistan, as told by their JTAC. The author/story teller is able to offer insight into the way MARSOC teams and JTACs operate in theater that can be somewhat hard to find. The book spends the majority of its time telling about the hardships of the war on terror, detailing a JTAC's day-to-day, but doesn't skimp out on more exciting subjects. One section of the book tells of an OP gone wrong, which results in a blue on blue airstrike and the aftermath following.
Special Forces communities have always been interesting to me, and among them, JTACs have always commanded a particular level of respect and interest above even the usual. These are men who are qualified special forces operators who elect to go a few steps more and also qualify as air-traffic controllers.
I can't imagine the stress of crunching numbers in your head, referencing grids on a map, communicating back and forth with a controller or pilot, and still plotting an effective strike, all while under fire. For reference, civilian air traffic control is rated a 91/100 in stress by O*Net, leaving just a handful of jobs above it.