Former army officer Hastings Fredrickson is accused of being the ringleader of the so-called "Knights of the Jedi Council" - a group of officers who exchanged degrading emails involving up to 10 women.
In court on Tuesday, Fredrickson pleaded guilty to three counts of using a carriage service to cause offence.
Three other similar charges were withdrawn by the Commonwealth.
More than 180 people have been forced out of the ADF this year for various offences.
Fredrickson is due to reappear in court on August 22.
More than 180 Australian Defence Force members have been sacked in the last 12 months for misconduct including sexual offences, reported the ABC earlier today.
Two-thirds involved the use of banned substances, according to figures obtained by the public broadcaster.
Among those fired is Hastings Fredrikson, the alleged leader of the so-called “Knights of the Jedi Council”, who faces six charges of using a carriage service to offend after allegedly sharing explicit videos and emails.
138 of those dismissed were from the Australian Army, with 26 from the Navy and 18 from the Air Force.
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