I was watching Generation Kill and the Lt. raised his sniper on the radio with 'Hitman 2-2 Echo 5 Romeo'. Why is there an additional 'E5R' after the callsign and what does
![Amazon.com: Generation Kill (Audible Audio Edition): Evan Wright, Patrick Lawlor, Tantor Audio: Books Amazon.com: Generation Kill (Audible Audio Edition): Evan Wright, Patrick Lawlor, Tantor Audio: Books](https://m.media-amazon.com/images/I/61iNNN+IHCL.jpg)
Amazon.com: Generation Kill (Audible Audio Edition): Evan Wright, Patrick Lawlor, Tantor Audio: Books
![Generation Kill, FXA Short Stay In Switzerland, BBC1Gossip Girl, ITV2Beverly Hills 90210, E4 | The Independent | The Independent Generation Kill, FXA Short Stay In Switzerland, BBC1Gossip Girl, ITV2Beverly Hills 90210, E4 | The Independent | The Independent](https://static.independent.co.uk/s3fs-public/thumbnails/image/2009/01/31/16/123838.jpg?width=1200)
Generation Kill, FXA Short Stay In Switzerland, BBC1Gossip Girl, ITV2Beverly Hills 90210, E4 | The Independent | The Independent
![Amazon.com: Generation Kill: Devil Dogs, Ice Man, Captain America, and the New Face of American War: 9780425224748: Wright, Evan: Books Amazon.com: Generation Kill: Devil Dogs, Ice Man, Captain America, and the New Face of American War: 9780425224748: Wright, Evan: Books](https://images-na.ssl-images-amazon.com/images/I/A1UHShMndnL._AC_UL210_SR210,210_.jpg)
Amazon.com: Generation Kill: Devil Dogs, Ice Man, Captain America, and the New Face of American War: 9780425224748: Wright, Evan: Books
![Cast members of 'Generation Kill' recreating the iconic photo of the Marines from the 1st Reconnaissance Battalion together with the embedded journalist/author Evan Wright. c.2003 [2520×1572] : r/MilitaryPorn Cast members of 'Generation Kill' recreating the iconic photo of the Marines from the 1st Reconnaissance Battalion together with the embedded journalist/author Evan Wright. c.2003 [2520×1572] : r/MilitaryPorn](https://preview.redd.it/dfuv8jjaa2h71.jpg?auto=webp&s=affbcc3ef890d1553ed4bc4f2cc97504b339c6b8)