Help with bug identification!

I have been picking cucumber beetle off of my squash plants for a few days since they began appearing here. I have run into a number of other bugs which I don"t know how to identify however. Actually in my whole garden the only thing that has had any significant pests at all are the squashes so far, a handful of aphids on my potatoes but they aren't very damaging.

This was found on a zucchini plant, I think they are soldier beetles but I couldn't find any pictures of green ones. Hopefully they are, I understand that they eat cucumber beetles and their eggs. They dont seem to eat the plants, it looks like its peering around the corner of the leaf though.

And I found one of these on my potatoes, super weird looking, its a black bug with a sort of turtle shell over top of it. I don't know if they are pests or what and they don't move very quickly.

First is a click beetle http://en.wikipedia.org/wiki/Click_beetle

Second one is a Tortoise Beetle http://en.wikipedia.org/wiki/Cassidinae

Neither one is particularly bad for the plants they seem to be on around here.

The first certainly does look like a click beetle.
While I think the adults just mooch around,
their larvae aka wireworms adore potatoes and can tunnel their way through an entire crop.
But they love meat fat even more than potatoes-
my grandad used to bury onion bags of fat in the potato patch, with a marker.
Every week or so he'd dig it up, dump it in a bucket of water for a day to drown the wireworms, then bury it again.
As for that other bug-it looks cool!

I don't know what the first beetle is, but the turtle bug is VERY DESTRUCTIVE, especially in large numbers.
Personally, I generally leave most black beetles shaped like that alone because in my experience, they eat a lot of destructive bugs.