A M142 HIMARS launches a rocket on the Bakhmut direction on May 18, 2023 in Donetsk Oblast, Ukraine.Photo by Serhii Mykhalchuk/Global Images Ukraine via Getty ImagesUkraine's ammo shortages are also affecting its US-made HIMARS, an American veteran told BI.Soldiers are now having to pass on targets they once would have hit, he said.Ukraine has had to get "more and more selective with their targets," giving Russia an edge.Ukraine's insufficient supply of ammunition means its soldiers can't hit the targets they want with even their most effective weapons, a US veteran now fighting in Ukraine told Business Insider.Such weapons include the US-made High Mobility Artillery Rocket Systems (HIMARS), with soldiers unable to use it to hit the same targets that they could earlier in the war when they had more munitions available, the veteran, Jonathan Poquette, bold Business Insider.He said his unit had good support from HIMARS — a long-range, high-precision rocket launcher that can hit targets 50 miles away — but its effectiveness was degraded as rockets ran low.Poquette is a sniper with Chosen Company, part of Ukraine's 59th Motorized Brigade.