Designed to a US Army Air Corps requirement the Model 167 flew as the XA-22 attack bomber prototype in March 1939. This was rejected by the USAAC, but 115 of the Model 167F version with Wright R-1820 radials had already been ordered by France. The order was increased by 100 Model 167A.3 bombers with R-1830 radials. Only 139 had been delivered before the fall of France in June 1940. The other 76 were taken as Maryland Mk I reconnaissance bombers by the Royal Air Force, which had order another 75 of the same type with 1,050-hp R-18300-SC3G radials. Great Britain also ordered 150 examples of the Maryland Mk II with more powerful engines. The type became operational with the RAF in September 1940, and was used most effectively in the Mediterranean theater as a long range reconnaissance type until supplanted by the same company's Baltimore.

Description	Specifications
Manufacturer: Martin	Length: 46 ft. 8 in.
First Flight: March 1939	Height: 14 ft. 11.75 in.
Model: F	Wing Span: 61 ft. 4 in.
Crew: Three.	Wing Area: 538.5 sq. ft.
Nickname: Maryland	Empty Weight: 11,213 lb.
Basic Role: Reconnaissance bomber.	Max. Weight: 16,809 lb.
Other Versions: Model 167F initial French model. 167A.3 French attack bomber. Maryland Mk I British version. Maryland Mk II improved model.	Armament: Four fixed and two trainable 0.303-in 7.7-mm machine guns, the latter in dorsal and ventral position, and up to 2,000 lb of bombs.
Principal User: France, Great Britain, South Africa.	Propulsion
Performance	Power Plant: Pratt & Whitney R-1820-S3C4G Twin Wasp radial piston engines.
Range: 1,080 miles with maximum bomb load.	Horsepower: 1,200-hp.
Max. Speed: 278 at 11,800 ft.	No. Of Engines: Two
Ceiling: 26,000 ft.
Climb Rate: 1,790 ft. per minute.