hero.php

<?php
$image = get_sub_field('background_image');

if( !empty($image) ):

	// thumbnail
	$size = 'large';
	$thumb = $image['sizes'][ $size ];

endif;

?>

<div class="hero" style="background: url('<?php echo $thumb; ?>')">

     <div class="overlay">

          <div class="department-badge">
               <img src="<?php the_sub_field('badge'); ?>" />
          </div>

          <div class="text">
               <?php the_sub_field( 'text' ); ?>
          </div>

     </div>

</div>