Dynamic. Self-assertive. Self-protective. These are words some experts used to describe Marine Corps commandant Gen. Jim Amos–or at least, how they believe his signature describes him. Writing for MilitaryTimes’ Off Duty section, handwriting experts Sheila Lowe, Kimon Ianetta and Reed Hayes took a look at the John Hancocks of all the military service leaders, including the Commander-in-Chief. President Barack Obama’s mostly-illegible signature “signals a strong need for privacy,” Lowe said, while Army Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, is “unable or unwilling to tell it like it is” judging from his autograph, she said. As for…