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SOOS--Stacked Oscar On Scout--was what it was called when the 1985 decision was made to replenish the Operational (Oscar) Transit constellation with unflown first-production models. Early Oscars were flown one at a time on Scout rockets, but by the time that they decided to replenish the constellation, Scouts could now carry two stacked atop one another: SOOS.
Are there any images of this payload?
I found this image of a SOOS payload in the document The Navy Navigation Satellite System (TRANSIT)
The first part of this quote actually refers to the image in the question, which is also from the linked document.
In the stacked configuration on the booster, the upper spacecraft (shown in the background) looks like a normal OSCAR. The lower spacecraft (in the foreground) is surrounded by a cradle that carries the load of the upper spacecraft during launch. The cradle remains permanently attached to the lower spacecraft as shown
Figure 7 shows the stacked configuration on the booster fourth stage with the solar panels removed from the upper spacecraft.
