AA

These are all (bad) acronyms of astronomy projects, a proud tradition in the field. The words at bottom are part of the acronym expansions, with each one missing some words (bracketed below):

• AGHAST: A Grism [H]-Alpha [SpecTroscopic] survey
• MBONE: Multicast Back[bONE]
• GANDALF: Gas AND Absorption Line [Fitting] algorithm
• JIVE: Joint [Institute] for [VLBI] in [Europe]
• YORIC: Yet another [Optimal] Resolution Image Constructor
• NEAT: [Near] [Earth] Asteriod Tracking
• GALAPAGOS: Galaxy Analysis over Large Areas: Parameter Assessment by Galfitting [Objects] from Sextractor
• DUNES: DUst disks around [NEarby] Stars
• GADZOOKS: Gadolinium Antineutrino Detector Zealously Outperforming Old Kamiokande, [Super!]
• SERVS: Spitzer [Extragalactic] Representative [Volume] Survey
• SHEEP: Search for the High Energy [Extragalactic] Population
• CANGAROO: Collaboration between Australia and [Nippon] for a Gamma Ray Observatory in the Outback

Taking only the elements of the acronyms that come from the missing words spells:

HST
ONE
F
IVE
O
NE
O
NE
S
EV
E
N

HST program 15117 is "Beyond Ultradeep Frontier Fields and Legacy Observations", or BUFFALO.