YUMA PROVING GROUND, Arizona – U.S. Army Yuma Proving Ground (YPG) commenced testing of prototypes for the Next Generation Rocket Assisted Projectile (NGRAP) on February 11, 2026, seeking to significantly extend the range of existing 155mm howitzer systems. The tests aim to characterize the strength and performance of a modern projectile design, according to officials.
The NGRAP is intended to replace the M549A1 rocket projectile, which was originally developed in the 1970s. Steve Flores, YPG Long Range Precision Fire Integrator, stated the new projectile will supersede the legacy system. Currently, a 155mm howitzer shell with rocket assistance can reach approximately 30 kilometers at its maximum range. The NGRAP seeks to surpass this distance.
A key aspect of the testing focuses on a redesigned joint and base closure, explained Jonathan Armijo, a test officer at YPG. “We are testing a new, one-piece joint with a base closure on the end,” Armijo said. “It is a characterization test of the strength of the design, how the projectile holds up to the stresses of firing and how the rocket performs.” The addition of a rocket motor to artillery projectiles introduces variability in trajectory, necessitating rigorous testing to ensure reliability, and accuracy.
The M549A1, the projectile NGRAP is designed to replace, is a two-part, 155mm rocket-assisted projectile utilizing a high-explosive warhead constructed from high-fragmentation steel. The M549A1 has a maximum range of 30.1 kilometers when fired from an M198 howitzer. It contains 15 pounds of TNT or Composition B explosive.
YPG has a long history of artillery testing, evolving alongside advancements in munitions technology. The proving ground has previously tested guided and semi-guided munitions capable of achieving accuracy within meters of a target, even at considerable distances. The NGRAP testing continues this tradition, focusing on extending the range and improving the capabilities of artillery systems.
Accelerated aging tests of the NGRAP’s rocket motor are as well being conducted, alongside live-fire tests at YPG. These tests are designed to simulate long-term wear and tear, and to identify potential failure points, including those that could lead to a short round due to non-ignition of the rocket motor.
