Cliff (Junior),
Having “blown up” your medal photo I am 99% certain number 4 is the 1914 Star or 1914 British Star as it is often called. The other possibility is the 1914-15 Star which would have 1914-15 across the front rather than 1914.
I quote:
The British awarded two star medals during World War I, the 1914 Star and the 1914-15 Star:
• 1914 Star: Also known as the Mons Star, this bronze medal was awarded to British forces who served in France or Belgium from August 5 to November 22, 1914. It was primarily given to the "Old Contemptibles", the pre-war soldiers of the British Expeditionary Force. The medal was accompanied by the British War Medal and the Victory Medal.
• 1914-15 Star: This medal was awarded to military personnel and some civilians who served between August 5, 1914 and December 31, 1915. It was not awarded to those who had received the 1914 Star.
Medal number 3 on your photo is the British War Medal and number 5 the Victory Medal (sometimes called the Allied Victory Medal). As you can see from the above, having qualified for the 1914 Star John would have automatically qualified for the other two.
Thus we can conclude John was in France/Belgium before 22nd November 1914 which was less than 4 months after WW1 started.
Regarding the Order of the Cloud and Banner medal this link takes you to a Wikipedia page and a list of some of the recipients of the medal:
en.wikipedia.org/wiki/Order_of_the_Cloud_and_Banner
As you can see a large number of those listed are USA WW2 Airmen, many high ranking but also some lower ranking. Now your Public Family Tree shows your father Clifford Francis Burk (191902009) wearing WW2 military uniform and his on-line obituary tells me he “served four years in U.S. Army Air Corps, in WWII”. Perhaps you have good reasons to refute what I am implying.
Regards, David.