Located inside the church.

In the early morning hours of March 24, 1944, a B-17 from the 422nd Squadron, 305th Bomb Group, 40th Combat Wing, crashed upon takeoff from the airfield at RAF Chelveston. Eleven aircrew died, along with 8 members of the 1121st Quartermaster Company and  876th Chemical Company who were sleeping in their barracks. In addition, 2 local children were also killed in the crash. 

The USAAF personnel on the aircraft were:

First Lieutenant William D Sellers, the pilot, from Birmingham, Alabama*;
Second Lieutenant David A Rementeria, the co-pilot, from Canyon City, Oregon*;
First Lieutenant Jack E George from Texas*;
Second Lieutenant Myer Silber, buried in the United Hebrew Cemetery, Halethorpe, Maryland;
First Lieutenant Charles Wesley Leake from Markham, Illinois;
Top Sergeant Jessie or Jesse H Lehr from Bolivar, Mississippi;
Staff Sergeant Kenneth I Mace, buried in Delaware, New Jersey;
Top Sergeant Donald C Parrish, buried at Troy, Michigan;
Sergeant Dale E Rishel from Uniontown, Pennsylvania;
Staff Sergeant Loyde J Judd from Freeport, Maine;
Corporal Joseph N. A. Grugnale, from Dedham, Massachusetts

An asterisk indicates burial in the American cemetery at Madingley [Cambridgeshire].

The Quartermaster Company personnel were:

Private Frank J Amato, buried in North Arlington, New Jersey;
Private First Class Michael R Arato, from New York*;
Corporal Sebastian J Attilio, buried in Fort Lee, New Jersey;
Private First Class Arnold N Chipoletti, 30, buried at New Kensington, Pennsylvania;
Sergeant Edward W Dell, buried in Lincoln, Nebraska;
Private First Class William Loren Dickerson, buried in Largen, Virginia;
Nils S Johnson, from Worcester, Colorado;
Robert Paul McClain is buried in Shelbyville, Indiana.

Source:

https://bedsarchives.bedford.gov.uk;

 https://americanarchive.iwm.org.uk; 

https://www.501csw.usafe.af.mil/

First Plaque:

WORLD WAR 1939 - 1945

IN MEMORY OF THE MEN WHO DIED ON THE NIGHT OF 24TH MARCH 1944 WHEN BOEING B - 17G FLYING FORTRESS SERIAL NUMBER 42-97578 OF 422ND SQUADRON 305TH BOMB GROUP CRASHED JUST NORTH OF YELDEN CHURCH.

Second Plaque:

WORLD WAR 1939 - 1945.
REMEMBER
SERGEANT CHARLES HENRY HILTON, ROYAL AIR FORCE, OF YELDEN, KILLED ON ACTIVE SERVICE
24TH AUGUST 1943.
KEITH EDWIN PHILLIPS, AGED 14 YEARS, MONICA RUTH PHILLIPS, AGED 4 YEARS, OF YELDEN,
KILLED BY AN AIRCRAFT WHICH CRASHED NEAR THIS CHURCH 24TH MARCH 1944.