War & Military - 77 free documentaries about frontline reporting.
Start with Mosul (39 min, FRONTLINE PBS), then Returning From the Iraq War With PTSD - The Soldier’s Heart (55 min, FRONTLINE PBS). All 77 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on frontline reporting is War Is a Force That Gives Us Meaning by Chris Hedges.