GSA font here refers to the font used in the logo of GSA or The General Services Administration, which is an independent agency of the United States government, established in 1949 to help manage and support the basic functioning of federal agencies.
The logo of the GSA is probably custom made and designed based on Frutiger Bold. Designed by Adrian Frutiger in 1976, Frutiger was commissioned by the newly built Charles de Gaulle International Airport to develop a signage system and the final design turned out to be a simple, clean, robust sans serif that is highly legible. More details about the typeface can be found here.
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The Frutiger font identified above is not available for free, please follow the link above and purchase the font. Meanwhile, you can take a look at our collection of fonts for cars, pop music and apparel as well as round-ups of new & fresh fonts around the web.