Easter during WW2 was not the holiday and chocolate-fest it is today. The Religious aspect was still the important thing, the celebration of Spring, new births, new beginnings, after a long winter was particularly apt.
Lent became harder to observe, but also more meaningful, when rationing meant that you had so little to give up that any sacrifice really did make a difference in your life. Celebratory meals required serious planning and going without elsewhere to make rations stretch. Sweets were rationed, and a carrot on a stick is no substitute. Even eggs, that special symbol of Easter, were unavailable for their usual uses, no Pace Eggs, no Egg rolling, no Easter egg hunts. Worst of all, loved ones away from home, service personnel might find even themselves fighting through Easter, if they remembered that it was Easter at all.