I think you are a
BUZZ
You may think I'm a drone,
If you hear a buzz, you may think of say a male bee
Some say I'm a rumour,
Buzz is gossip or rumour.
But near to a murder, I've no sense of humour.
A buzz kill stops the fun.
When I'm at a road, You'll notice a bird,
The buzzard, buzz at a Rd.
Some fashionable jargon, From me and a word.
A buzzword is jargon, popular in some circles.
At the head of marines,You may see me trim,
Marines have buzzcuts which are close-cropped hair styles.
With a unit of distance, From an actor, named Tim.
Tim Allen voiced Buzz Lightyear in Toy Story.
I count in fives,As part of a game,
Fizz Buzz can be write a program that prints the numbers from 1 to 100 and for multiples of 3 print Fizz instead, and for the multiples of 5 print Buzz.
But two is my number, A household name.
Buzz Aldrin, the second man on the moon.
Title: Career Full of Excitement
Buzz is excitement