The fact that the Great Commission is not called the Great Mission is a vital part of fulfilling our calling in life? God calls us to live our His Mission together with the two recipients of the Great Commandment (Love God and Love Others). Yes, God calls us on Mission alongside Him and on Mission alongside other followers of Christ.
Now, within that reality we must face the fact that we may all be on different legs of the same race. That doesn’t mean we shouldn’t cooperate and collaborate. For instance, read Joshua 1:12-16:
 And to the Reubenites, the Gadites, and the half-tribe of Manasseh Joshua said,  “Remember the word that Moses the servant of the LORD commanded you, saying, ‘The LORD your God is providing you a place of rest and will give you this land.’  Your wives, your little ones, and your livestock shall remain in the land that Moses gave you beyond the Jordan, but all the men of valor among you shall pass over armed before your brothers and shall help them,  until the LORD gives rest to your brothers as he has to you, and they also take possession of the land that the LORD your God is giving them. Then you shall return to the land of your possession and shall possess it, the land that Moses the servant of the LORD gave you beyond the Jordan toward the sunrise.”  And they answered Joshua, “All that you have commanded us we will do, and wherever you send us we will go.
The 2.5 tribes already made it to their ‘promised land’ yet were still enlisted into a ‘co-mission’ with the other tribes. What a great picture of our responsibility and opportunity as followers of Jesus! What a great picture of why we help missionaries or support church planters. Let’s make sure that we don’t forget to put the ‘CO’ in Commission. In a world full of much individualism we can choose to serve God by living on Mission yet forget to do so with others that He places us with and/or near.