The big data providers license the data sets from the relevant rights-holder e.g. TNA for censuses, ONS for Civil registration indices. They take care to cite the source of what they're displaying (probably a condition of their licence), and typically do their own indexing and imaging. (One notable exception is some of the Civil Registration data provided by ...
The numbers in parenthesis can be indicative of the number of the year that the Cadet participated in the activity.
Buzzard (2) would equate to participation in "Buzzard" during year 2.
Class Football during year 2.
Numerals during year 2.
Crew Squad during year 4.
Wrestling Squad during year 2.
Water-Polo Squad during year 1.
An alternative would ...
Some information I have helps add weight to your translation and that of @CanadianGirlScout:
Luka Cacic and Karlo Cacic, lived outside Kansas City, MO in Sugar Creek.
My Grandmother Manda Suknaic came to USA in 1913 and to Sugar Creek, MO to live with a brother-in-law.
According to my Grandmother's birth certificate Her mother Mara Cacic and Father ...