This question wouldn't accept "General Martok was very brave." as an answer, which it seems like it should for consistency. It required "is" instead of "was".
You are correct. The tense variations had not been added as acceptable answers. I have now added them. In the future it should accept "was" without a problem. Thanks for pointing that out. You can also just use the report flag and mark "my answer should have been accepted" and it will note your variation in the system for us to add later.