"We are short in 'here-and-now' basic munitions like small diameter bombs. Our near-peer competitors continue to modernize their weapons systems and leverage new technologies to close capability gaps between us and them.
"We must maintain our capability to operate in contested environments. Additionally, we must continue to expand cross domain fires capabilities and focus on joint integration to strengthen deterrence and enable joint combined maneuver. Priorities include long-range and stand-off strike weapons, anti-ship weapons, advanced air to air munitions, theater ballistic/cruise missile defense, torpedoes, naval mines, and a Cluster Munitions replacement."
Admiral Harris said investment was needed in torpedoes and mines as well as developing systems to defeat incoming missiles.
As well as hitting ISIS in Syria and Iraq, US drones have been blasting targets in Yemen.
Five suspected members of Yemen's Al-Qaeda branch were killed Sunday in what local authorities said was a US drone strike east of the capital Sanaa.
The early morning strike targeted a car in central Marib province that had been transporting arms from Yakla in Baida province.
The official said the car belonged to a known local leader of Yemen's Al-Qaeda in the Arabian Peninsula, which the United States views as the radical group's most dangerous branch.
Sunday's strike comes 24 hours after a similar raid killed three suspected AQAP operatives in southern Shabwa province, which has been a central target of the US military.