Event is the wrong term. Trend would be better.
The army was modernizing and many of the colorful trappings associated with older uniforms were done away with. I think the change in chevron direction was part of that change.
It was the second such change in the history of the army uniform. In the 1840s cheverons were pointed up.
Further in 1902, most of the army was concentrated in the Phillipines. I'm sure the smaller, OD cheverons adopted in 1902 made it harder for the enemy to spot and shoot NCO's.
One more point. The 1902 army wss three times larger than the Indian fighting army. Smaller chevrons were probably cheaper.
James B. Ronan II
To Join the Company of Military Historians click here