Arknights Welfare CC#1, Rotating Test Site 4, Reward #1 Clear

Contingency Contract #1 Pyrolysis, Rotating Test Site Chernabog: Area 13 Ruins, Reward #1 Standard Aptitude Test (complete operation with score of 200) Cleared using only Welfare Operators.
Got this one done just under the wire. Made a kill zone in the upper middle, with lots of arts damage. Also had vanguards constantly generating DP (picked the DP not generating naturally contract). And finally let the Enraged Possessed Throwers and Armorless Union Third Squad Leaders coming from the bottom left gate make it all the way to the right side before deploying people to handle them. I needed to work on having a defender the last operator deployed at any time, so that they would be targeted by the Throwers and Armorless Leaders. And I needed to retreat some operators from my main kill zone to have deployment slots to deal with these. It was a bit tense at the end.
Welfare operators are as defined at:
arknights.wiki...
wiki/Operator/Welfare.
Comments and advice are always appreciated.