I believe the Captain's advice (against using "get" in writing) arises from your specific question. I'd like everyone to understand that--as a general matter--one need not ban "get."
In AE, at least, "get" (in all its forms) is regularly (and correctly) used in both informal and formal writing.
The following from Vocabulary.com offers these usage examples--all of them but one having been published on March 2, 2014, and all from well-respected publications.
(I have omitted nine other example sentences from the following list because they were direct quotations and therefore might represent oral rather than written usage of "get.")
But working-class married men remain hardest to win over and, unless they are in unions, get the least attention — to the dismay of some partisans. New York Times, Mar 2, 2014
In Peoria against the Colorado Rockies, Blake Beavan will get the start. Seattle Times, Mar 2, 2014
At Villarreal I did win a trophy in a way because I got them to the Champions League. New York Times, Mar 2, 2014
But their support for his re-election fell to 35 percent, roughly what Democrats have gotten since they lost to Richard Nixon. New York Times, Mar 2, 2014
But even though they got off to a slow start, the Bruins drew even late in the period. New York Times, Mar 2, 2014
By the time the family got there, however, the Russians had all vanished, disappearing as quickly and mysteriously as they had appeared. New York Times, Mar 2, 2014
He did what he could to get their attention. New York Times, Mar 2, 2014
The commission's first report said the Welsh government should get powers over some taxes, including stamp duty, and have limited powers to borrow money. BBC, Mar 2, 2014
Creamer captured eight titles early in her career before getting her breakthrough win at a major at the U.S. New York Times, Mar 2, 2014
He got the broadcaster to introduce him, then borrowed a boy’s plastic disc and skidded downhill. New York Times, Mar 2, 2014
The move worked out fine, with Nieto also getting a great chance in the first period when he broke in from the left boards. New York Times, Mar 2, 2014
Have you ever tried to get a selfie with 10+ people? Time, Mar 2, 2014
In December, Creamer got engaged to Derek Heath, which she said put some of her past difficulties in perspective. New York Times, Mar 2, 2014
Turnovers are down compared with 2012-13, presumably because ball handlers are not getting raked across the arms. New York Times, Mar 2, 2014
But Ms. Christian did not get to call her daughter a year later. New York Times, Mar 2, 2014
They can also get daily earnings updates on their mobile phones. New York Times, Mar 2, 2014
Once they get by the first defender, they barrel to the hoop to score or create contact to draw a foul. New York Times, Mar 2, 2014
Some regional specialists said Mr. Obama should ignore the talk-tough chorus and focus instead on defusing a crisis that could get much worse. New York Times, Mar 2, 2014
Before we pick what is admittedly the smallest of nits, let’s just get this out of the way: Cadillac can do little wrong right now. BusinessWeek, Feb 11, 2014