I don't have exact statistics on the numbers (my guess would be in the hundreds of thousands, if not millions), but I had an idea to illustrate this going backwards.

One of the most iconic images from the Eastern Front was the raising of the Red Banner over the Reichstag. It's similar to the flag over Iwo Jima as far as the cultural significance and subsequent fame of the photograph.

Here it is - https://upload.wikimedia.org/wikipedia/en/1/14/Reichstag_flag_original.jpg

Several soldiers were involved, and as it was one of the final famous actions of the war (took place on May 2, Soviet Victory Day is May 9th), it fulfills your criteria.

Mikhail Petrovich Minin (Михаи́л Петро́вич Ми́нин) was the in the first group to raise the flag on April 30, and guarded the position until May 1. He joined the Soviet Army on June 4, 1940, 18 days prior to the start of Barbarossa. The Germans took down the flag, and the famous photo wasn't taken till the next day when Soviet forces took full control of the area.

Meliton Varlamis Kantaria (Мелитон Варламович Кантария) hoisted the flag on May 2nd. He joined the Soviet army in 1938 (he's Georgian), but did not take part in combat until December 1941. Still counts I think.

Mikhail Aleskeyevich Yegorov (Михаи́л Алексе́евич Его́ров) was the other soldier to hoist the flag, but he did not officially join the war until 1944, although he was a partisan in the Smolensk region.

Aleksey Prokopyevich Berest (Алексе́й Проко́пьевич Бе́рест) was the commanding officer of the mission. He joined the army in 1939 and took part in the Winter War, prior to WW2.

I'm sorry for the Wiki links, but this is very off the cuff, and I don't have any other sources handy. Hope this is OK, mods.