Custom Fields Question

If you want to display a single custom field (post meta) then you can use:

get_post_meta();

It has three arguments.

1. The ID of the post
2. The name of the post meta field (country_flag)
3. Whether or not the value returned is a single string (in your case it will be);

So the usage might be something like this:

$country_flag = get_post_meta( $post->ID, 'country', true );