Flowers of The Forest is traditional at military funerals. The Collier Recruit is another favourite of mine; and Johnny Is Gone For A Soldier too. Here's Love Farewell one I sing often...
I thought I heard the Colonel crying- March brave boys there's no denying
Cannons roaring- drums a beating- March brave boys there's no retreating
Love farewell

If I should fall in far off battle- Cannons roar and rifles rattle
Thoughts fly homeward- words unspoken- Valiant hearts are oft times broken
Love farewell

Will you go or will you tarry- will you wait or will you marry.
Would this moment last forever- Kiss me now and leave me never
Love Farewell

I thought I heard the Colonel crying- March brave boys there's no denying
Cannons roaring- drums a beating- March brave boys there's no retreating
Love Farewell

Yours, Aye. Dave