Signing of the Japanese Surrender

The transcript describes a historic signing ceremony where MacArthur removes his gloves to sign a significant document. General Umetsu signs for the Japanese Imperial General Staff. MacArthur then signs in front of over 100 allied officers. The pen used by MacArthur is given to General Wainwright as a souvenir, honoring his hardships in enemy prison camps after the fall of the Philippines.

Who received the first pen used by General MacArthur and why was it significant?

What hardships did the man who received the pen endure?