These folks have put up a free counter template. It's designed for The Longest Day, but can probably be used for other games as well. The file opens with Photoshop or a free program like FastStone Maxview.
Here's what they say about it, including the download link:
We've had several requests for counter reprints for The Longest Day.
That is way to much work for us to do right now, but we did put together
a counter template for TLD so YOU can assemble counters on a sheet and
print them (or have us print them). The template is a multi-layer PSD
file and you will need Photoshop to use it. I could create a multi-layered TIFF file it you want, just let me know. Simply turn on the layers you want, turn off the ones you don't, flatten the image, copy, and paste to a separate sheet, then un-do the flattened image and make the next one. If you use it and make changes to it, send it back so we can keep it up to date - we are releasing this template to the public domain.
http://ahgeneral.org/gameparts/tld_counter_template.psd