In comparing land-based capabilities, the Army found that its artillery was falling short of Russian and Chinese weaponry.
The Navy conducted a ground test of a precision-guided projectile the Army fires from cannons, manufacturer Raytheon said.
The extended-range artillery cannon could help eliminate threats for ground troops and other military assets, Esper said.
The service wants its extended-reach cannon to have lighter muzzle brakes.
In addition to U.S. and coalition strikes, Iraqi fighter aircraft have also attacked ISIS targets inside Syria recently.
The Extended Range Cannon Artillery weapon is designed to hit ranges greater than 70 kilometers.
Senior Army officials mapped out a plan to dramatically increase the range of the service's artillery and missile systems.
The Army's proposed 2019 budget would add 4K soldiers to the active force and purchase large quantities of missiles.
A new budget request features an increase in big guns and artillery rockets as well as a plus-up of some 1,100 Marines.
The Marine Corps has hauled at least one program of record to the curb -- and is looking for more to cut.