Columns: No. in season | No. in series | Title | Directed by | Written by | Original air date | U.S. viewers (million)
1 | 69 | "Line of Departure" | John T. Kretchmer | Debra Fordham | March 6, 2011 | 4.2 | 2 | 70 | "Command Presence" | Carl Lawrence Ludwig | Karen Maser | March 13, 2011 | 3.3 | 3 | 71 | "Movement to Contact" | John T. Kretchmer | Rebecca Dameron | March 20, 2011 | 3.8 | 4 | 72 | "On Behalf of a Grateful Nation" | John Terlesky | T.J. Brady & Rasheed Newson | March 27, 2011 | 4.7 | 5 | 73 | "Soldier On" | Rob Spera | Bill Rinier | April 3, 2011 | 3.3 | 6 | 74 | "Walking Wounded" | Chris Peppe | James Stanley | April 10, 2011 | 3.4 | 7 | 75 | "Strategic Alliances" | Melanie Mayron | T.D. Mitchell | April 17, 2011 | 3.4 | 8 | 76 | "Supporting Arms" | Emile Levisetti | Mary Leah Sutton | May 1, 2011 | 3.1 | 9 | 77 | "Countermeasures" | James Bruce | Debra Fordham | May 8, 2011 | 3.3 | 10 | 78 | "Battle Buddies" | Brian McNamara | Tanya Biank | May 15, 2011 | 3.2 | 11 | 79 | "Drop Zone" | Rob Spera | James Stanley | May 22, 2011 | 3.6 | 12 | 80 | "Firefight" | John Terlesky | Rasheed Newson | June 5, 2011 | 3.4