Brave Spectator

[Todd]

Hi welcome to the site, let me give you some comments on your poem.

The use of brave is a bit problematic. You use it in the title, the first line, and a couple other times. I don't think the repetition adds to the poem much. If I were going to cut down on the uses of the word, my preference would be to leave the title alone because I like the semi-ironic idea of being a brave spectator. Bravery is usually demonstrated by action and I like the subtle dig in the title. The further uses of the word for me at least weakens the poem.

It’s easy to be brave from here--I will admit though to liking the easy tone of these three lines in the opening strophe.
Because the mountains are miles away--This mountain idea you introduce and expand upon is a versatile literal and metaphorical foundation. Optionally, you could choose to overlay another layer into the poem--basically running a metaphor and literal interpretation in parallel rather than keeping it open.  It may not necessarily be better but might open up some creative space for you which is good to do sometimes in the early part of revision.
And I’ve never carried a pack.--This is the bravery that comes from a lack of experience, the fools rush in sort of bravery. 
 
Three days from now
I’ll crawl halfway up a rockfall
While my bravery stays behind in a grove of aspens.--This could easily be replaced with courage. Though it might be a better choice to simply imply fear in the image (shivering of the leaves, maybe or some such).
 
Above my right shoulder
The mountain has me lassoed
By a fishing-pole.--This phrasing felt awkward to me.

I'll claw my way up that hill— --I don't see what this adds as a standalone line that "I'll crawl halfway up a rockfall" didn't give you already. I also think claw my way borders on cliche.

A signal corps recruit,
Or some great uncoordinated beetle--Condense this a bit. It seems a tad clunky.
Looking back now and again
to find my brave spectator--No need to go back to the title here.
Trembling in the tree line.--See this is what I was sort of talking about earlier on the aspen line above. Something quick and subtle rather than the longer line above. Good ending.

I hope the comments help some. 

Best,

Todd