Joou Heika no Hokyuusen

Front-line soldiers call the logistics squad the fat pigs in the back. But this is a proud story of the underestimated and ridiculed group. Two years since the war between the Kingdom and the Republic began, amidst the inhumane fighting, they are the "soldiers who fight for the soliders." With a burning desire in their hearts, the 202 Experimental Logistics Squad drive the rail train "Ravik" across the deadly front line and through the hellish battlefield to bring life!
(Source: Kodansha, translated)