In battle, the manual of arms called for the rifle to be fired until empty, and then recharged quickly. Due to the well-developed logistical system of the U.S. military at the time, this consumption of ammunition was generally not critical, though this could change in the case of units that came under intense fire or were flanked or surrounded by enemy forces. The Garand's "en bloc" clip system proved particularly cumbersome when using the rifle to launch grenades, requiring removal of an often partially loaded clip of ball ammunition and replacement with a full clip of blank cartridges.