Alrighty, we know there are both Marines and a Confed Army that are used groundside...
Equipment-wise we only know generalities. They use laser weapons on the ground normally, because they don't need to fear hull breaches. They have armour, though we don't know much about it... Grenades, charges, medical kits and all kinds of other equipment are present. There are many little details in the books that you'd have to put together, but it's basically an idealized extension of modern day forces.
We know they have a form of hover tank thing that is used on the ground. Turrets and gun emplacements are used as well. We've seen both missile launchers and silos.
For air support, both space-craft and specialized air-craft are used.
[edit:] Also, the only detailed information we have on most marine technology is in the Confed Hanbook... That is, of course, out of date through most of the series.
Well, if Confed is anything like the good ol US, they'll be using the equipment well into 2700. Heh heh, seriously. Besides, in "Fleet Action," I think Tolwyn says that their Wildcat fighter had been in service for over 100 years. Now that's quality.