The association is aware six units have been tested, or
The association is aware that six units have been tested. Which one is correct?
You can usually omit "that" in cases like this. It's a judgment call. My rule of thumb is to include "that" in formal writing and drop it in informal.
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You can usually omit "that" in cases like this. It's a judgment call. My rule of thumb is to include "that" in formal writing and drop it in informal. But in this case, the sentence looks naked without it.