|First appearance||War Buddies, Part 4|
|Known ability||Plant growth|
|Date of death||November 20, 1968|
|Home||Au Co, Vietnam|
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Au Co, flanked by her female friend and some guards, makes massive vegetables grow from the ground instantly. She watches as farmers cultivate the crops. After Dallas and Austin destroy much of Au Co's village, a woman screams for Au Co. Dallas realizes the Skyhawk crew's mission was to destroy the girl, not the village.
After returning home from the Vietnam War, Linderman briefly remembers an experience from his and his fellow comrades' mission. The experience is of himself seeing Au Co's dead body on the ground with her friend embracing her in grief.
Au Co had the ability to accelerate the growth of plants, quickly raising them to fully-grown, fruit-bearing plants.
- According to artist Jason Badower's blog, Au Co is supposed to be about 10 years old, which means she would have been born circa 1958.
- In Vietnamese mythology, Au Co is the name of a fairy who married a dragon and gave birth to the Bach Viet, the first Vietnamese people.
- Au is the chemical symbol for gold. Hence, Au Co could be read as "Gold Company".
- Au Co is the chemical formula for hypoeuctectic Gold-Cobalt, a highly ferromagnetic substance used in dental castings.
- For other uses of Au Co, see Au Co (disambig).