>>5734100Pegasus Hobbies has an E-Z Snapz line of military aircraft including WW2, they have some snap tanks and vehicles as well. Revell has Snaptite which is mostly cars and aircraft with a couple tanks. I got a couple of pic related to fit in with my army men collection, it's Snaptite and apparently hard to find now. Most hobby stores I've visited have a few snap-together models in with the glue and paint stuff.
You could also try out Mega Bloks' Call of Duty line, they make some great vehicle sets.