1960 – SLOMAR Space Tug – The Martin Company (American)

  Above: The 2-man Space Tug Extra Images sourced from here. Cancelled Projects: SLOMAR By Jos Heyman (with some help from the correspondents of the Secretprojects forum) In 1959 the US Air Force started the Space Logistics, Operations, Maintenance and Rescue (SLOMAR) study to generate preliminary designs of crewed space vehicles that could support manned …

1958 – Astrotug – Lockheed (American)

Astrotug in Operation – Artist's Conception The Astrotug Tugboat for Space: Spaceborne scientific laboratories and platforms for further exploration into space are an accepted concept based on established engineering techniques. Components would be fired  as individual units into space, on precalculated orbits, and there assembled. To solve the major problems of how men are to …

1959-61 – Concept O-9 Manned Utility Tug – (American)

Concept O-9: Rendezvous by Manned Utility Tug From a report compiled between 1959-61 and presented in 1961 are various concepts {Suffixed by 'O' for Orbital Rendezvous). This extract only selects those concepts that have a manipulator component. WADD TECHNICAL REPORT 60-857 LAUNCHING AND ALIGHTMENT SYSTEMS FOR AERO-SPACE VEHICLES Nelson T. Levings, Jr. Cleveland Pneumatic Industries, …