CBS has announced a March 7 premiere of The Unit and a March 13 debut of Julia Louis-Dreyfus' The New Adventures of Old Christine, giving the Seinfeld alum the Mondays-at-9:30 slot behind Two and a Half Men. (Get. Out!) As a result, Jenna Elfman's Courting Alex and its time-slot predecessor, Out of Practice, will move to occupy Wednesday's 8 o'clock hour, replacing Yes, Dear and Still Standing, which, apparently, were still on the air.