The Astros also unfurled a giant U.S. flag , introduced the five branches of the military .
The Astros also recognized Sergeant Nicholas Low , a combat veteran who served six years in Iraq , by presenting him with free Whataburger for an entire year .
The Astros also unfurled a giant U.S. flag , introduced the five branches of the military and recognized Sergeant Nicholas Low , a combat veteran who served six years in Iraq , by presenting him with free Whataburger for an entire year .