Question: Why did Perry chose the military plot in the song?
About the article "Part of Me (Katy Perry song)", section "Reception".

Candidate passages:
The video garnered positive reviews from critics, who praised its self-empowerment theme and its different approach in comparison to Perry's previous music videos.
Bruno Nessif of E!
Online compared the video to Demi Moore's role in G.I.
Jane.
Ray Rahman from "Entertainment Weekly" echoed the similarity of the G.I.
Jane influence in the video, and called it an "intense ride".
MTV's James Montgomery praised the video and Perry's role, saying:"Over the years, Perry has been a California Gurl, a nerdy teenager, an alien and just about everything in between, but up until now, she's never really been an actual person."
He went on to praise the video stating: "Part of Me" is unlike any pop video in recent memory.
Rihanna did military chic in her "Hard" video (she even straddled a tank), and just about every one of Perry's pop contemporaries have ventured down the same path.
But they were never really in the military; they were just making it more fabulous.
Perry takes the opposite tact: She cuts off her hair, she eschews makeup, she fights, crawls, suffers.
It's a commendable level of commitment.
Your move, everybody else.
"Feminist author Naomi Wolf criticized the video as propaganda for the Marine Corps, stating "I really want to find out if she was paid by them for making it ... it is truly shameful.
I would suggest a boycott of this singer whom I really liked if you are as offended at this glorification of violence as I am."
Glenn Selig, founder of The Publicity Agency, responded to these claims on Fox News Live, stating, "In her efforts to boycott the video, Naomi Wolf has brought more attention to it, without her comments, most people would clearly have seen the military simply as a metaphor and not as an attempt by Katy Perry to glamorize the military or war."
Perry told MTV that she chose the military plot because it represented the song, saying, "It's an affirmation of strength, so I wanted to go the strongest route I ever could."
The plot of the music video Diana Ross performs the song in a city full of casinos and clubs. 
"Tyler Perry's For Better or Worse" is an American comedy-drama series created and produced by playwright/director/producer Tyler Perry.
The series is based on Perry's 2007 film "Why Did I Get Married?"
and its 2010 sequel "Why Did I Get Married Too?".
It premiered on TBS on November 25, 2011.
Led by the comical, over-the-top antics of Marcus and Angela Williams, the ensemble follows three couples: Marcus and Angela, Joseph and Leslie, and Richard and Keisha who are at various stages of their relationships as they go through the ups-and-downs of married life and dating.
On February 20, 2013, it was announced that TBS chose not to renew the series, and that the Oprah Winfrey Network since ordered a third season as part of a new deal the network made with Perry.
It has been announced that the series has been renewed for a fourth season and is scheduled to premiere in April 2014. 
"Why'd You Change Your Mind" relates, to a certain degree, to Neeson's efforts to comprehend why a friend of his chose to commit suicide.
Neeson explains: "In the chorus of the song I'm just trying to understand what goes through a person's mind and why they should take their own life."
In 2000, Perry was contacted by pop rock singer P!nk, seeking production and songwriting assistance on her second album.
Perry commented on the experience in an interview with HitQuarters: "She was this white girl singing R&B music, and it made absolutely no sense to me why she would call me.
So when I got together with her my instinct said, 'Don’t go and be an artist again, don’t get another record deal, find out what you can do with her.'
My manager freaked out when I called her and said, cancel all the showcases!"
Perry co-wrote and produced much of Pink's successful album "Missundaztood", which brought Perry back into the spotlight as a music producer.
Perry took full writing credits for the songs "Get the Party Started" and "Lonely Girl".
Perry next provided Christina Aguilera the hit "Beautiful".
Since then, she has gone on to work with many artists, including Jewel, Courtney Love, Gwen Stefani, Alicia Keys, Celine Dion, Blaque, Sugababes, Lillix, Robbie Williams, Melissa Etheridge, Sierra Swan, Solange Knowles, Gavin Rossdale, Juliette and the Licks, Lisa Marie Presley, Fischerspooner, Unwritten Law, L.P., Kelly Osbourne, James Blunt, Cheap Trick, Ben Jelen, Enrique Iglesias and Giusy Ferreri.
The 2002 Faith Hill album "Cry" has a song co-written by Perry and Alecia B. Moore (P!nk).
In 2003, Perry won two ASCAP awards for her songwriting, and a Grammy Awards nomination for her song "Beautiful" as a contender for "Song of the Year"; the song received the award for Best Female Pop Vocal Performance at the 2004 Grammy Awards.
With actress Gina Gershon, she wrote the song "StupidStar" for the movie "Prey for Rock and Roll."
With Brooklyn rocker L.P., she co-wrote "The Darkside".
For most of 2004, Perry remained behind the scenes, making another appearance with Camp Freddy, this time at Lo Anglees' Live 103's Birthday Concert.
She joined Lisa Marie Presley on stage for songs they wrote together.
The year 2004 also saw the release of Courtney Love's solo "America's Sweetheart", to which Perry heavily contributed.
A song called "Girls & Boys", which was originally intended for Pink but later recorded by Britney Spears, was released as a bonus track on Spears' European DVD release.
The track marked Perry's foray into more electroclash-inspired tunes.
She collaborated with art-dance duo Fischerspooner on a few songs for their upcoming release and ended the year with a few co-writing credits on Gwen Stefani's debut, "Love.
Angel.
Music.
Baby.
", including the album's first single, "What You Waiting For?"
Additionally, her Atlantic-distributed label, Custard Records, was launched to promote two new acts, Sunshine and James Blunt.
She produced and played guitar on the recording of Blunt's song "No Bravery".
The year ended with Perry co-writing "Save Me" for the southern California punk rock band Unwritten Law.
Releases for 2005 included Kelly Osbourne's second album, which was written and produced by Perry.
The lead track from Osbourne's second album, "One Word", reached the top of the UK and US dance charts.
Perry contributed to Christina Aguilera's third studio album, "Back to Basics" (2006).
Perry and Aguilera co-wrote every song.2007 saw Perry working with Vanessa Carlton on her third studio album, "Heroes and Thieves".
She also co-wrote and did session work on many of the songs on Sierra Swan's solo album, "Ladyland".
She continued work with Courtney Love, Kelis, Cheap Trick, Ziggy Marley, Ben Jelen, Skin, Enrique Iglesias, The Format on the song "Dead End", and "Darker Side of The Moon" on Bay Area artist Goapele's "Change It All" album.
In 2007, Perry won an award from the San Francisco chapter of the Recording Academy for her contribution to the world of music.
The years 2007 and 2008 saw more tunes written or produced by Linda Perry: The Section Quartet, Alicia Keys, Vanessa Carlton, and Gina Gershon.
In 2008, Perry signed the group Little Fish to her label and began producing its album, titled "Baffled and Beat", which was released in August 2010.
In 2009, Perry wrote and produced "A Loaded Smile" for the debut album "For Your Entertainment" by Adam Lambert.
Aguilera's fourth studio album, "Bionic", released in 2010, included another track, written and produced solely by Perry, "Lift Me Up".
In 2010, she worked with KT Tunstall and wrote a few songs with her, some of which would later be featured on Tunstall's third studio album Tiger Suit, released in September of that year.
In June 2010, Perry announced on her Facebook and Twitter profiles that she was "going to make an album" with her new band Deep Dark Robot, which she founded with Tony Tornay.
The album, "8 Songs About a Girl", was promoted with the single "Won't You Be My Girl?".
Perry imagined the name Deep Dark Robot as part of an ad-libbed song lyric—"deep dark robot falling in love"—and decided to hang onto the name for her next musical project.
The band released the album in March 2011 and began touring.
Perry also Worker with Rivers Cuomo and Weezer on their song "Brave New World.
"In 2010 and 2011, Perry, along with Fox Entertainment Group, was the Presenting Sponsor of the Los Angeles talent show STARFEST, benefiting The L.A.C.E.R.
Afterschool Programs.