php loop with image as id - let's you call image size

acf-image-id.php

<?php


	$args = array(
		'post_type' => 'volunteer-opportunit', // enter your custom post type
		'orderby' => 'date', // order
		'order'=> 'ASC', //reverse order
        
	);

	$loop = new WP_Query( $args );
	
			
	
	if( $loop->have_posts() ):
		echo '<div class="row stretch-xs center-xs">';
				
		while( $loop->have_posts() ): $loop->the_post(); global $post;

		echo '<div class="col-xs-12
                col-sm-12
                col-md-4
                col-lg-4 row stretch-xs">';

		?>
            
		 <div class="box staff-box volunteer-box">

			
			 <!-- the image -->
			 
			<?php 
				$size = 'volunteer';
				$image = get_field('volunteer_image');
		

				if( $image ) {

					echo wp_get_attachment_image( $image, $size );

				}

				?>
			 
			 <!-- the image -->
			 
			 <?php the_title( '<h3>', '</h3>' ); ?>
				
				
			 

		</div>
        
              
		

		<?php
        
		echo '</div>'; //end section inner
		
        endwhile;
		echo '</div>'; //end row
		
	endif;


?>