Bottom-left of Page 22 in the Codex, 2nd Paragraph under "Drop Pod Assault"
"Any command squad, sword brethren squad, dreadnought or crusader squad (Not black templar assault squads!) and all types of Terminator squad, that number 10 models or less may be equipped with a drop pod..."
It should also be noted that Terminators still count as two models, so you'd have a max of 5.
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