Rob Kelk pointed me at you, and mentioned you wanted to help cleaning up behind some of our less... grammatically adept users. You are very welcome to do so. The one fellow Rob hinted about is a user by the name of "Jason taylor" (with a lowercase t, yes), who is a prolific contributor to certain tropes with military themes, but is less than concerned with matters of markup and grammar -- more of the former than the latter, but he is prone to punctuation errors and "it's/its" and "then/than" confusions among other things. If you want to keep an eye out for his contributions, he has yet to create a user page, so his name is in red on the Recent Changes and history pages -- it pops out at you.
Of course feel free to fix anything else you spot, either with him or anyone else. Sometimes it's easiest to just use the Random Page link in the menu to the left and clean up whatever page it gives you.
As for outright vandalism, we have surprisingly little -- the moron who followed in your wake was the first real instance in months. We get far more spammers, and even then, one only appears every few weeks. But again, feel free to revert anything that looks like it needs it, and if you spot a spammer before anyone else does let one of us admins know so we can take further steps against them.
Anyway, welcome again and thanks for volunteering to help improve our overall quality.
-- Looney Toons, admin