Solution to Ready Set Go

Each string is three items that canonically form a set of three interleaved. The singular name for each set fits in the blanks.

LEILSTTAHUOATNIVANIIAA	ESTONIA LATVIA LITHUANIA	BALTIC STATE
LEEGJXUIEDSILCATCUIITIVAVEEL	EXECUTIVE LEGISLATIVE JUDICIAL	BRANCH OF GOVERNMENT
GFOMRANYKLINCERRNDSEH	GOLD FRANKINCENSE MYRRH	GIFT OF THE MAGI
GRVTEANANTIDLEL	TALL VENTI GRANDE	STARBUCKS SIZE
BBBLUOUTBTBESRCSLEUPOMS	BUBBLES BLOSSOM BUTTERCUP	POWERPUFF GIRL
AAPRAOTRMHTIHOOSSS	ATHOS PORTHOS ARAMIS	MUSKETEER
CDAPOMAVRARRIEONGORTATSI	DOMINGO CARRERAS PAVAROTTI	TENOR
HAANSTMMEVIRILRRUP	HAMMER ANVIL STIRRUP	EAR BONE
LGIQSUAOILSDID	SOLID LIQUID GAS	PHASE OF MATTER
OBARTICUUGHTSTEE	ACUTE RIGHT OBTUSE	ANGLE
GRBRELUEENDE	RED BLUE GREEN	PRIMARY COLOR
EJWLGRFAK	EWR JFK LGA / NEWARK KENNEDY LAGUARDIA	NEW YORK AIRPORT CODE
CEHAMRILLAOTYNTNEE	EMILY CHARLOTTE ANNE	BRONTË SISTER

The red letters spell out LAMCRUORRLYYE, which can be unscrambled to get LARRY CURLY MOE. The final answer is thus STOOGE.