PDS will be excused for any failure to perform its services due to any cause beyond its reasonable control, including without limitation, fire; explosions, strikes, work stoppages, labor strife, riot, war, acts of the public enemy; acts of God, including floods, hurricanes, tornadoes, earthquakes, unusually severe weather, and natural disasters; acts of terrorism; local or national disruptions to transportation networks or operations; material equipment repairs; fuel shortages; governmental regulations; embargo; quarantine; or governmental request or requisition for national defense. PDS will use commercially reasonable efforts to continue its performance to the extent not affected by the force majeure event.