I decided to redo a mission, taking the plantgirl-waifubate with me. The mission was to rescue a prisoner, but what I've read about the mission, there's three more there, and one has a skill I really needed. Opened the attack on the first outpost with sleep-gas artillery... which did exactly squat except put them on alert, since every single enemy in the world at this point is wearing a gas mask*.
Charged in the side of the main building, using nonlethal bullets everywhere(only lethal I had was a sniper rifle, grenades, and C4). Found two of the prisoners in the building, dragged both to the roof for extraction. After capturing the outpost with plantsniper support
twice**, I started interrogating some of the surviving guards for the last optional prisoner. Found him, extracted him. Intel from the rescued prisoners and interrogated guards put me on track to the target prisoner, the next major outpost away.
Sent my support buddy on ahead to scout while I flat out ran the whole way. As soon as I get there, I get my sniper in position and have her start opening fire. As they return fire to her position, I try sneaking in, only to be spotted by a guard in a tower. In danger of being overrun by superior numbers(and dwindling ammo), I call in helicopter support. Under that help, I make into the main courtyard to see the base's anti-aircraft gun blasting away at my helicopter... and then the helicopter focused on it, blowing it up. I had intel on not only the main prisoner, but two more in the base. As the chopper was still tearing shit up, I ran in, grabbed and extracted both. The main prisoner was too injured for normal extraction, so I blew up the AA radar and ordered the chopper to stop killing stuff and land right in the courtyard. Mission complete, and I got the all-important Transportation Specialist I needed.
Metal Gear Solid V: The Phantom Pain. Got an A-Rank, though I already had S-rank on that mission.
*Not sure if it's normal by chapter ~15 for so many gas masks, or if it's in response to my usual tactic of disabling groups by using a smoke grenade and laying a smackdown when they're immobilized by it.
**Reinforcements showed up and people started waking up before I was done. I also discovered that the enemy was employing decoy dummies which were marked as normal enemies, throwing me off.