According to the “Army intelligence” network reported on November 28, according to the U.S. Department of defense recently released photos, the U.S. military has used the newly acquired m109a7 self-propelled gun for live ammunition test. < / P > < p > U.S. Army Future command, gray wolf brigade, and more than 14 high-end private organizations came to analyze the new m109a7 self-propelled gun to find ways to improve the firing rate of this new weapon. < / P > < p > in April 2014, the US Army obtained the first batch of m109a7 with low initial production rate. In November 2015, the U.S. Army awarded BAE Systems a $245.3 million contract to complete the low rate initial production of the m109a7. In December 2017, the US Army awarded BAE Systems a contract, which opened the way for full rate production of m109a7. < / P > < p > according to the introduction, the m109a7 is the latest model in the M109 series. It is equipped with a 155mm caliber cannon. Its maximum range is 24km without auxiliary ammunition and 30km with auxiliary ammunition. The self-propelled gun can also launch extended range projectiles guided by GPS.