Both were candidates for NATO Basic Military Requirement 1 (NBMR-1) in the 1950s for a light weight tactical strike fighter (LWTSF) capable of carrying both conventional and tactical nuclear weapons from rough airfields and having simple maintenance requirements.
The SNCASE Baroudeur in particular was given it did not have conventional landing gear, instead using a wheeled trolley for take-off and three retractable skids to land: