Gratuitous Tank Battles

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[GA]NuclearShadow Aug 1, 2013 @ 12:37am
How on Earth do I stop the mechs?
I'm five missions in and the mechs are what always cause the majority of damages to my towers They all have shields and even when I fill the map with anti-shield and anti-armor they always end up so numerous that they get through anyways. I realize I am suppose to be able to upgrade my towers through customization but everytime I do it tells me it is invalid even if the gear I am attempting to use is fitting of the tower type and doesn't have a lock symbol on it.