deniable operations in space

if I were to recruit aliens as deniable soldiers for country A 

for operations mainly in other star systems and other galaxies 

then what is country A willing to offer those aliens 

if they become deniable soldiers for country A 

and afterwards when they retire 

if I already have recruited aliens as deniable soldiers for country A 

for operations mainly in other star systems and other galaxies 

then what is country A willing to offer those aliens 

when they are deniable soldiers for country A 

and when they retire 

for example 

will those aliens that are deniable soldiers for country A 

be allowed to visit planet earth's star system 

be allowed to visit planet earth 

be allowed to live on other star systems near earth 

be allowed to live on other planets in planet earth's star system 

and so on 

practical reasons should be considered 

if I recruit extremely many aliens as deniable soldiers for country A 

then they would be too many to visit planet earth 

even if it were on separate occasions