I am trying to run a query to load a checkbox and dropdown where the user can select who else was involved on a project, but I cannot figure out how to save this data since each checkbox/dropdown would be unique, any ideas?

// Staff Dropdown
add_action('add_meta_boxes', 'jpg_affiliated');
function jpg_affiliated()
{
add_meta_box('jpg_affiliated_staff', 'Who Was Involved?', 'jpg_affiliated_staff_callback', 'post', 'normal', 'default');  
}
function jpg_affiliated_staff_callback($post)
{
$values = get_post_custom($post->ID);
wp_nonce_field('jpg_affiliated_nonce', 'jpg_affiliated_nonce_field');
?>
Select any staff that were involved in this event and what their role was.
<?php
$team = new WP_Query(array('post_type' => 'jpg_profiles','post_status' => 'publish','posts_per_page' => '-1', 'orderby' => 'title', 'order' => 'ASC'));
while($team->have_posts()) : $team->the_post();
?>  



" />
<?php the_title(); ?>


Select role...
Primary Shooter
Second Shooter
Third Shooter
Lighting Assistant
Photo Booth Coordinator
Marketing Coordinator
Studio Manager
JPG Team Member
Photographer
                



  
<?php
endwhile;
wp_reset_postdata();
}

add_action('save_post', 'jpg_save_associated');
function jpg_save_associated($post_id)
{
// Bail if we're doing an auto save
if(defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) return;

// if our nonce isn't there, or we can't verify it, bail
if(!isset($_POST['jpg_affiliated_nonce_field']) || !wp_verify_nonce($_POST['jpg_affiliated_nonce_field'], 'jpg_affiliated_nonce' )) return;

// if our current user can't edit this post, bail
if(!current_user_can('edit_post')) return;

// Probably a good idea to make sure your data is set   
if(isset($_POST['jpg_test'])){update_post_meta($post_id, 'jpg_test', esc_attr($_POST['jpg_test']));}
}
?>