How to add markup inside a form radio button div
I was able to follow @Alfred's advice above and used the #theme element to make this work.
I added this to my module theme hook:

'my_module_is_member_radios' =&gt; array(
  'render element' =&gt; 'form',
  'template' =&gt; 'templates/my_module_is_member_radios',
),


and in the template used this:

$armedForcedInfo = "some markup";
$civilianInfo = "some more markup"

$variables['form'][0]['#suffix'] = $armedForcedInfo;
$variables['form'][1]['#suffix'] = $civilianInfo;
print drupal_render($variables['form'][0]);
print drupal_render($variables['form'][1]);