Mission 72 – Confront Paul 'Puppy' Simmons
The route from last time (north parking lot, down through the shed, up through the sewer) is not a bad route. More guards, but not a lot of overwatch.
Especially in the middle section, between the trucks and garbage corrals, you may find it handy to simply trail target into a quiet area and take them out, rather than luring them into ambush.
The tacvest has respawned in the southeast trailer, if you need it as well. When ready, make your way back to the office where the Vargas used to be. Two sentries can be lured to their respective dooms, leaving two guards are in the little watchroom here, and one more in the office with Puppy. Sneak or blast- You have plenty of time to clear them out and convert your target before reinforcements arrive.