It's a pdf of a document from the Directorate-General for External Policies, Policy Department. The document is entitled: On The Way Towards A European Defence Union - A White Book As A First Step.
Here's the abstract:
ABSTRACT
This study proposes a process, framed in the Lisbon Treaty, for the EU to produce a White Book (WB) on European defence. Based on document reviews and expert interviewing, this study details the core elements of a future EU Defence White Book: strategic objectives, necessary capabilities development, specific programs and measures aimed at achieving the improved capabilities, and the process and drafting
team of a future European WB. The study synthesizes concrete proposals for each European institution, chief among which is calling on the European Council to entrust the High Representative with the drafting of the White Book.
*If you can find the PDF, then the executive summary is interesting, especially as regards chapter 3.