USMC WWII Named Knapsack

[garandman114]

Hello All, I have a Boyt '43 USMC knapsack that is named to two different people, The darkest stencil says "HARRIGAN" and the fainter stencil on teh pack says "KELLEY I.B." or "KELLEY L.B." Also on the back are some sort of unit markings that say A-153 and then A-62 under that. Would anyone happen to know what unit this denotes and if there is any way to find out what unit these guys served in? It may be a shot in the dark but I just got curious about the markings Thanks!