Drupal 6 - Remove N/A from list of Radio button options

When creating a radio button field with CCK, you can remove the "N/A" option by making the field required.

fyi...to make your options turn into checkboxes, change "Number of values" to something other than 1.

Found this great write-up on the Drupal website "Upcoming event calendar using date, views and cck":

http://drupal.org/node/326061#comment-1077193