cryptanalysis organization: crossword clues

Matching Answer
Confidence
NSA
60%
DECODE
52%
ELKS
20%
NASA
20%
REDCROSS
20%
AMA
20%
MENSA
20%
ASSN
20%
UNITEDNATIONS
20%
ROTC
20%
e.g. Greek Cheese
e.g. O?D (Use ? for unknown letters)