Wikipedia on Australian volunteer defence force:
The Volunteer Defence Corps (VDC) was an Australian part-time volunteer military force of World War II modelled on the British Home Guard. The VDC was established in July 1940 by the Returned and Services League of Australia (RSL) and was initially composed of ex-servicemen who had served in World War I.[1] The government took over control of the VDC in May 1941, and gave the organisation the role of training for guerrilla warfare, collecting local intelligence and providing static defence of each unit's home area.[1] General Harry Chauvel, who had retired in 1930, was recalled to duty in 1940 and appointed Inspector-General of the VDC. Chauvel held this position until his death in March 1945.[2]

Foreward:
"I am very glad that the volunteer defence corps decided to have a book of its own this year, and, as the corps was raised and maintained during its early years by the returned soldiers league, and as the original members had all served in the late war, it is fitting that this book should appear on the Fourth Anniversary of the establishment of the V.D.C. in Australia...
On guard brings to the people of Australia and to their allies an account of the doings of members of the corps in all parts of the commonwealth. Essentially it is a book of the rank and file of the VDC and in prose, verse and picture our members have told the story of their widely varied experiences.

These books were written, illustrated & prepared by Serving Personnel of the Australian Service & include anecdotes, stories, poems, cartoons together with details of the fighting in which they participated. Profusely illustrated both in colour & black & white. The date enclosed in brackets is that of the original publication & indicates that the book is a reprint otherwise it is a first edition. Each series is complete.