An interesting translation question of "top secret" used as a phrase here, as in "Top Secret", by a translator looking for "Confidential" or similar English relative word, or if it is a matter of "top" as in biggest/most important single secret.
Also, yes, it took the English language many years to come up with the pithier "Loose lips sink ships".
Also, yes, it took the English language many years to come up with the pithier "Loose lips sink ships".