DCMA has a lookup function on its website that will give you the information. Here's how it works.
First, go to DCMA's Website
Next, select Contract Management Team (CMT) from the Customers Tab
That will open a search box that looks like this:
You can search by contract number or CAGE code. Lets go to DoD contracts awards and find a contract number. These are the contracts awarded on January 15, 2015.
We scroll down and find an Army contract awarded to L-3 Communications:
We enter the contract number into the search criteria:
Now you've got the ACO name, his/her email, and phone number.