B-26B 41-17834 91, B-26B-40s 42-43269 67 and 42-43287 88. Great photo for comparing the short wing and long wing models. Note that aircraft 67 has had its top turret faired over but seems to still have the plexiglas "ball" on the tail turret instead of the typical pointed tail cone of an AT-23A. Other two aircraft have their turrets installed but no guns.
Source of photo: 344th bomb group : Captain Robert D. Conrad Pilot 344th BG 494th BS