![The Sikorsky R-4 was the world's first large-scale mass-produced helicopter and the first helicopter used by the US Army Air Forces, Navy, Coast Guard, and the UK's Royal Air Force and Royal Navy. Credit:USAF [Public domain], via Wikimedia Commons](http://yaffa-cdn.s3.amazonaws.com/adm/images/dmImage/StandardImage/Sikorsky_R4B_web_65728C90-2F3B-11E5-99E306EE95C51C2D.jpg)
Sign in
Thank you for visiting AustralianDefence.com.au - Australia's leading source of Defence Industry news and viewsTo continue reading this article, and to gain free access to up to four articles per week, simply sign up to the ADM Standard Membership. A Digital Membership will give you unlimited access to online news and articles except those marked as Premium. Or to get unlimited access on any device, at any time, upgrade to ADM Premium. Premium members have the run of the site and also receive a subscription to our renowned print magazine, early-bird rates to ADM Events, and our exclusive Top 40 Defence Contractors Special Report. To keep reading, join today.
Attention Australian Government Department of Defence staffDefence staff should contact askalibrarian@defence.gov.au to obtain login details. For complimentary hard copies of Australian Defence Magazine or the Directory of Defence Suppliers contact subscriptions@yaffa.com.au with name and postal address. |
