The Pentagon and Army are now firing the Hyper Velocity Projectile from an Army Howitzer in order to potential harness near-term weapons ability, increase the scope, lethality and range ability to accelerate combat deployment of the lethal, high-speed round.
The hypervelocity projectile costs only $25,000 per round.
As the Navy was developing EMRG, it realized that the guided projectile being developed for EMRG could also be fired from 5-inch and 155mm powder guns. Navy cruisers each have two 5-inch guns, and Navy Arleigh Burke (DDG-51) class destroyers each have one 5-inch gun. The Navy’s three new Zumwalt class (DDG-1000) destroyers, the first of which entered service in October 2016, each have two 155mm guns.
The projectile, which weighs about 23 pounds,42 is a hypervelocity projectile when fired from either EMRG or a powder gun, but the term HVP tends to be used more frequently in connection with the concept of firing it from a powder gun.
When fired from 5-inch powder guns, the projectile achieves a speed of roughly Mach 3, which is roughly half the speed it achieves when fired from EMRG, but more than twice the speed of a conventional 5-inch shell fired from a 5-inch gun. This is apparently fast enough for countering at least some ASCMs (cruise missiles). The Navy states that “The HVP—combined with the MK 45 [5-inch gun]45—will support various mission areas including naval surface fire support, and has the capacity to expand to a variety of anti-air threats, [and] anti-surface [missions], and could expand the Navy's engagement options against current and emerging threats.”
One advantage of the HVP/5-inch gun concept is that the 5-inch guns are already installed on Navy cruisers and destroyers, creating a potential for rapidly proliferating HVP through the cruiser-destroyer force, once development of HVP is complete and the weapon has been integrated into cruiser and destroyer combat systems.
The Pentagon wants to take a weapon originally designed for offense, flip its punch for defense and demonstrate by 2018 the potential for the Army and Navy to conduct missile defense of bases, ports and ships using traditional field guns to fire a new hypervelocity round guided by a mobile, ground variant of an Air Force fighter aircraft radar.