Generally the individual who feels as if their contribution is greater will make demands such as financial rewards, greater leadership responsibilities, promotions, or even basic recognition. (This "equity theory" follows true in relationships also. For example, if one partner feels as if he/she is putting more into the relationship than the other, he/she may opt to leave.)
The military is a hard place to effectively use the equity theory due to the fact that the promotion system is based on a point and time in service scale rather than the individual accomplishment of leadership roles or demonstrating responsibility and character. When I was an E-4/Specialist (junior enlisted soldier) in the Army, I had a squad leader who was an E-5/ Sergeant (non-commissioned officer). Although we were the same age, she enlisted in the military two years before me and therefore had more time in service. We were both single parents, separated, working Finance and both "fast trackers" on the promotion scale. Aside from the difference in rank and the fact that she could run faster than me, I considered her my equal.
On a personal note, I worked long hours (I love my job!), came in early and always volunteered for unit projects. The company commander deemed me as the soldier in charge of our unit fund raising because of all the work I put into them. I was always volunteered by my command if I was not around to do it myself. If a project came up, so did my name.
Cited: "Adams Equity Theory." www.businessballs.com/adamsequitytheory.html "Equity Theory." www.changingminds.org/explanations/theories/equity_ theory.html Scholl, Richard W. "Primer on Equity." www.cba.uri.edu/Scholl/Notes/ Equity.html