Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Australians have taken to social media to remember the sacrifice of the Anzacs, as record numbers gathered at dawn services across the country to commemorate the 100th anniversary of the Gallipoli landing. Proud Aussies came together in huge numbers in Sydney, while more paid their respects in Queensland's regional and coastal towns of Gympie and Coolangatta. Tens of thousands also assembled at Melbourne's Shrine of Remembrance, despite cold and wet conditions, with some leaving home as early as 2.30am in order to honour the fallen. Large groups gathered elsewhere around the country, with the nation's capital Canberra in particular focus as many gathered in the dark outside the Australian War Memorial and spilling out far beyond the usual ceremonial area.Social media flooded with images of Anzac Day services across AustraliaRecord numbers gathered at dawn services held across the countryThis year marks the 100th anniversary of the Gallipoli landingMore than 10,000 people expected to attend centenary dawn service at the Gallipoli Peninsula in Turkey 
 Question:This Aussie documents his first _ as an Australian soldier.

Anzac Day