This venture effectively rendered the small Scout rocket obsolete.
In total 5 satellites were launched during the programme, all using American Scout rockets.
They were initially developed as the second stage motor of the Scout rocket.
I launcher, was used by eighteen Scout rockets between 1960 and 1964.
The probe was launched in June 1976, by a Scout rocket, and remained in space for near two hours, as intended.
The fourth stage of the Scout rocket also used the "Altair" stage.
Three more San Marco satellites would use Scout rockets.
Constructed in 1961, it was used by 69 Scout rockets between 1962 and 1994.
Following this, it was also converted for use by Scout rockets.
It was launched on July 20, 1964 on a Scout rocket.