useless trivia: What Word Means: A Greek Letter Related To S?

Questions

In 1926 Roger Moore, actor, (---------- , numerous James Bond movies), born. ?

In 1944 German Field Marshal ---------- Rommel commits suicide rather than face trial for his part in an attempt to overthrow Hitler. ?

In 1944 German Field Marshal Erwin ---------- commits suicide rather than face trial for his part in an attempt to overthrow Hitler. ?

In 1947 ---------- Yeager pilots the world's first supersonic flight (Mach 1.015 at 12,800 m) at Muroc, CA. ?

In 1947 Chuck ---------- pilots the world's first supersonic flight (Mach 1.015 at 12,800 m) at Muroc, CA. ?