OTTAWA -- The National War Memorial in Ottawa is always a focal point for Canadians in early November -- but today's Remembrance Day proceedings are proving extra poignant in the wake of last month's attack on Parliament Hill.

As the morning unfolds, ceremonies will march across the country; events have already begun in Halifax's Grand Parade Square, where hundreds -- including NDP Leader Tom Mulcair -- are assembled for the service.

A cannon shot rang out from Citadel Hill above the cenotaph as a bugler sounded the Last Post.

At Ottawa's towering granite and bronze national memorial, the recent deaths of Cpl. Nathan Cirillo and Warrant Officer Patrice Vincent are giving the ceremony an extra layer of meaning.

Huge crowds are already on hand. The Royal Canadian Legion says attendance could hit 80,000, or twice the normal turnout. It says poppy sales have jumped this year to more than 19 million compared with 18 million last year.

2014 also marks the 100th anniversary of the start of the First World War, as well as the 75th anniversary of the outbreak of the Second World War.

All the while, Canadian fighter pilots are flying in harm's way over Iraq.

Princess Anne, only daughter of the Queen, is attending today's ceremony with her husband, Vice-Admiral Sir Tim Laurence.

Gov. Gen. David Johnston is there, along with Prime Minister Stephen Harper, who flew halfway around the world from Beijing for the ceremony, after which he'll resume his travels almost immediately, bound for New Zealand.

Senior officers and politicians are also there, along with Gisele Michaud, the Silver Cross Mother, whose youngest son, Master Cpl. Charles-Philippe Michaud, died of injuries suffered in Afghanistan in 2009.

The diplomatic corps is out in force, along with various veterans groups and young people's organizations.

The commemoration will include the familiar rituals of the piper's lament, the Last Post, the artillery salute and the recitation of the Act of Remembrance taken from Laurence Binyon's poem, "For the Fallen."

"They shall grow not old, as we that are left grow old ..."

But there will also be a formal rededication of the memorial itself, to add the dates of the Afghanistan mission and the South African War.

There is also a new inscription: "In Service to Canada - Au service du Canada." The government says the inscription is intended to recognize all who serve, be it in the past, present or future.

It's the second time the memorial has been rededicated. In May 1982, the dates of the Second World War and the Korean War were added.

Princess Anne paid tribute to Cirillo and Vincent shortly after her arrival in Ottawa on Monday. She also spoke of the rededication

"As we stand on the verge of the monument's rededication, I am mindful of this continuum of history and the privilege given us as members of the Canadian Royal Family to share such important moments with you all," she said.

Her grandfather first dedicated the monument in 1939, just months before the Second World War began.