The 506th Infantry Regiment, originally designated the 506th Parachute Infantry Regiment (506th PIR) during World War II, is an airborne light infantry regiment of the United States Army.
 Currently a parent regiment under the U.S. Army Regimental System, the regiment has two active battalions: the 1st Battalion, 506th Infantry Regiment (1-506th) is assigned to the 1st Brigade Combat Team, 101st Airborne Division, and the 2nd Battalion, 506th Infantry Regiment (2-506th) is assigned to the 3rd Brigade Combat Team, 101st Airborne Division.
Jeffrey Matthew Settle (born September 17, 1969) is an American actor.
 He is known for playing Captain Ronald Speirs on the HBO miniseries "Band of Brothers" and Rufus Humphrey on the CW teen drama series "Gossip Girl".
Lieutenant Colonel Ronald C. Speirs (20 April 1920 – 11 April 2007) was a United States Army officer who served in the 506th Parachute Infantry Regiment of the 101st Airborne Division during World War II.
 He was initially assigned as a platoon leader in B Company of the 1st Battalion of the 506th Parachute Infantry Regiment.
 Speirs was reassigned to Dog Company of the 2nd Battalion prior to the invasion of Normandy in June 1944 and later assigned as commander of Easy Company during an assault on Foy, Belgium after the siege of Bastogne was broken during the Battle of the Bulge.
 Speirs also served in Korea, where he was assigned both as a rifle company commander and as a staff officer.
 He later became the American governor for Spandau Prison in Berlin.
 He reached the rank of captain while serving in the European Theater during World War II, major during the Korean War and retired as a lieutenant colonel.
 Speirs was portrayed in the television miniseries "Band of Brothers" by Matthew Settle.
The 507th Parachute Infantry Regiment (507th PIR), now the 507th Infantry Regiment, was an airborne infantry regiment of the United States Army.
 The regiment was initially assigned to the 82nd Airborne Division in World War II before transferring to the 17th Airborne Division.
 Now 1st Battalion, 507th Infantry Regiment is part of the United States Army Infantry School, subordinate to its Airborne and Ranger Training Brigade, responsible for the Army's Basic Airborne School, Jumpmaster School, Pathfinder School, and the "Silver Wings" Command Exhibition Parachute Team.
The 509th Infantry Regiment is an airborne infantry regiment of the United States Army.
 Previously titled the 509th Parachute Infantry Regiment (509th PIR) was the first parachute infantry unit of the U.S. Army to make a combat jump during World War II.
 Currently its 1st and 3rd battalions are active.
 The 1st Battalion serves as the Opposing Force (OPFOR) at the Army's Joint Readiness Training Center at Fort Polk, Louisiana.
 The 3rd Battalion is assigned to the 4th Brigade Combat Team (Airborne), 25th Infantry Division, at Fort Richardson, Alaska.
The 505th Infantry Regiment, originally the 505th Parachute Infantry Regiment (505th PIR), is an airborne infantry regiment of the United States Army, one of four infantry regiments of the 82nd Airborne Division of the United States Army, with a long and distinguished history.
The 502nd Infantry Regiment (502nd INF), previously titled the 502nd Parachute Infantry Regiment (502nd PIR), is an airborne infantry regiment of the United States Army.
 The regiment was established shortly after the American entry into World War II, and was assigned as a regiment of the 101st Airborne Division, "The Screaming Eagles", one of the most decorated formations of the U.S. Army.
 The regiment saw substantial action in the European Theater of World War II and was deactivated in 1945, shortly after the end of the war.
 Reactivating in a new form in 1956, the 502nd Infantry has served in the Vietnam War, the first Gulf War, Operation Iraqi Freedom, Operation Enduring Freedom in Afghanistan, and Operation Inherent Resolve in Iraq.
 It was removed from parachute status with the rest of the 101st Airborne Division in 1969, and since 1974, the regiment has been classified as an Air Assault unit.
 Currently, its 1st and 2nd battalions are active.
 Both battalions are assigned to the 2nd Brigade Combat Team, 101st Airborne Division (Air Assault).
Colonel Edward D. Shames (born June 13, 1922) is a retired United States Army enlisted man and officer who later served in the U.S. Army Reserve.
 During World War II he was assigned to the 506th Parachute Infantry Regiment, 101st Airborne Division.
 Shames is the last surviving officer of Easy Company, 2nd Battalion, 506th Parachute Infantry Regiment.
The 511th Parachute Infantry Regiment (511th PIR) was an airborne infantry regiment of the United States Army, first activated during World War II.
 It formed the parachute infantry element of the 11th Airborne Division.
The 503rd Infantry Regiment, formerly the 503rd Parachute Infantry Regiment (PIR) and the 503rd Airborne Infantry Regiment (AIR), is an airborne infantry regiment of the United States Army.
 The regiment served as an independent regiment in the Pacific War during World War II; at Fort Campbell, Kentucky; in Okinawa, Japan; and in Germany.
 Regimental elements have been assigned to the 2nd Infantry Division, the 11th Airborne Division, the 24th Infantry Division, the 82nd Airborne Division, and the 173rd Airborne Brigade Combat Team.
 Regimental elements have participated in campaigns in the Vietnam War, Operation Enduring Freedom–Afghanistan, and Operation Iraqi Freedom.
 The regiment claims 15 Medal of Honor recipients: two from World War II, 10 from Vietnam, and three from Afghanistan.
 A parent regiment under the U.S. Army Regimental System.
 The regiment's 1st and 2nd Battalions are active, assigned to the 173rd Airborne Brigade, based at Caserma Ederle, Vicenza, Italy.

Question: What is the birth date of this United States Army officer who served in the Parachute Infantry Regiment and was played by Jeffrey Matthew Settle in the miniseries Band of Brothers?
Answer: 20 April 1920