Full enrolment date is 16th January 1918.
Using the image viewer, there is 4 pages to the document & it is an enrolment form into the Women's Army Auxillary Corps.
Page 3 of the document seems to suggest employment in some capacity (maintenance repairs possibly but not sure) within the Royal Flying Corps.
The only way to be sure about the details is as rosie99 suggested above & download the document.
Hope this helps though!
Aitcheson, Aldred, Batty, Bauer, Bone, Brewer, Dean, Doyle, Durant, Fife, Finney, Gibson, Graham/Grayham, Hall, Harrison, Hersey, Hill, Holliss, Hudson, Hussey, Insley, Kelsey, King, Laver, Longmore, Luke, Mellor, Newman, North, Parker, Phillips, Porter, Read, Robinson, Rowel, Spink, Sproxton, Steer, Stevenson, Tanner, Witty/Whitty, Warburton, Wood.
(For more information on the above surnames please check the Surname Interest Table below.)