'''[[Lieutenant|Lt]]. / [[WingLieutenant Commander (rank)commander|WingLt. Cmdr]]. J.T. Marsh''' (it is never revealed what his initials stand for) was the first leader of the Able Squad. In episode 2.23, he is promoted to the rank of ''Winglieutenant Commander''commander and henceforth has two units under his command, Able and Baker Squads, while ''Lt. Nara Burns'' becomes the new leader of the former. Over the years, J.T. Marsh has proven himself as a man whom people will follow - even being the most famous and successful exosquad leader of the Exofleet, he remained a modest, attentive and likable person. In fact, the only one who has ever truly hated him was ''Phaeton'', the leader of Neosapiens, - as well as the only one who was equal to him in hand-to-hand combat (except the [[Neosapien#Neo Lords|Neo Lords]]), which clearly demonstrates Marsh's battle skills. One of his regular tactics in a space battle was to go for the enemy flagship, especially the well-defended [[bridge (ship)|bridge]], thus, [[decapitation|decapitating]] the opposing fleet. Over the time, Marsh has developed a mutual tender relationship with ''Colleen O'Reilly'', a Lieutenant of the [[#Jumptroops|Jumptroop Platoon]]. As the series progressed, it was revealed that Marsh was at one time as rebellious and gung ho as Yuri Stavrogan and Kaz in his youth, the first episode alluded to this when he disobeyed orders and went on a joy run with his squad in the canyons on Mars. Clearly, fighting against the Neosapiens served to remind Marsh of his duties and the nature of war itself. During the war, Marsh piloted a ''"Falcon" #AA-500 E-frame''.
